Hair removal on moles causes irritation, inflammation, changes mole structure.

Warm water opens cuticles, effectively removes excess dye.

Cutting above 90° creates layers, increasing thickness and movement in hair.

Thio relaxers break disulfide bonds in hair to straighten it, which can lead to damage if the hair is porous or uneven. A conditioner filler, rich in proteins and moisturizers, coats the hair, evening out porosity and providing a protective base, enhancing relaxer uniformity and reducing breakage. Conditioning alone or even color application doesn't address porosity, while faster action or dye removal are unrelated to the process's preparatory needs.

Skin lacking oil becomes dry, easily flaky, tight and irritated.

Hydrogen peroxide volume indicates its oxidizing strength, with 40 volume (12%) being a high-lift agent used for significant lightening. It produces more deposit (color change) and high lift, suitable for dark hair to blonde, but risks damage if not controlled. Low deposit options imply weaker solutions (e.g., 10 or 20 volume), making 40 volume's high-lift capacity the defining characteristic in professional hair coloring.

Heated thermal irons' temperature varies with the hair texture, as coarse or thick hair requires higher heat (e.g., 350-400°F) to style effectively, while fine hair needs lower heat (e.g., 250-300°F) to avoid damage. The Marcel iron technique, hair stylist skill, or manufacturer settings are secondary factors. Texture dictates heat settings to ensure styling without compromising hair integrity, a key principle in thermal styling.

Apply talc powder absorbs moisture, reduces pain, increases wax adhesion.

Correct: Option D - Slither the ends.

Test for salt allergy to avoid dangerous reaction before using dye.

Good hair (poor absorption) has tight cuticles, needs more chemicals.

Correct: Option C - Henna.

In hair bleaching, the developer (hydrogen peroxide) volume determines lift strength, with 40 volume (12%) being the highest safe concentration for professional use with bleach powder to achieve maximum lightening (e.g., black to pale blonde). Volumes like 20, 25, 30, or 35 are lower, used for less lift or gentler processes. Exceeding 40 volume risks severe hair damage, making it the ceiling in standard protocols.

Excessive hydrogen peroxide swells and damages the cuticle layer, breaking down the protein structure and increasing porosity. Overuse strips natural oils and structural components, making the hair more porous and fragile. It does not make the hair resistant, nor does it decrease porosity or cause keratinization in this context.

Nail growth originates in the matrix, where mitotic activity produces new cells that keratinize and push outward. The eponychium is the cuticle, the nail bed supports the nail plate, and the lunula is the visible matrix part, not the growth site. The matrix's role is analogous to the hair follicle, driving continuous nail extension, a key fact in manicure and nail health management.

Correct: Option C - 4.5 – 5.5.

The scientific study of hair, encompassing its growth patterns, structure, and associated disorders, is known as trichology, a specialized field that bridges dermatology and cosmetology. Trichology delves into the anatomy of the hair follicle, the cyclical growth phases - anagen (growth), catagen (transitional), and telogen (resting) - and conditions such as alopecia, dandruff, or excessive hair loss. This knowledge is invaluable for diagnosing scalp issues and tailoring hair care treatments, making it a cornerstone for professionals in hair restoration and salon services. Dermatology, while related, focuses more broadly on skin conditions including those affecting the scalp but is not specific to hair. Cosmetology involves the practical application of beauty techniques, including hair styling and coloring, but lacks the scientific depth of trichology. Biology, as a general science, covers all life forms and is too expansive to be specific to hair study alone.

Soft wax efficiently removes hair over broad regions such as legs arms and back. Tweezing and electric tweezers are slow and suited for small localized areas. Bleaching agents only lighten hair color and do not remove it.

A non-absorbent tool (disinfected spatula) prevents cross-contamination, according to salon standards.

Correct: Option B - A razors.

Moistening provides lubrication so the metal pusher glides without scratching the nail plate. This has nothing to do with circulation, the nail mantle, or visibility of the lunula.

Watery blisters and thick white skin between the toes are characteristic symptoms of athlete's foot.

Strand test checks time and effectiveness of dye on small hair strand.

<p>Why Oil Is Used:</p><p>Oil acts as an insulator and barrier.</p><p>It prevents the alkaline solution (which can be caustic) from directly touching the skin.</p><p>It reduces irritation or chemical burns caused by the galvanic current or the alkaline product.</p><p>It also helps the electrode glide smoothly on the skin’s surface.</p><p>In other words:</p><p>When the anode (positive electrode) pulls the alkaline ions from the negative electrode through the skin, the current can dry or irritate the skin.</p><p>Applying oil before the procedure protects and conditions the skin barrier from that reaction.</p>

Waving lotion that runs toward the scalp can be accelerated by body heat and cause overprocessing or irritation. Applying the lotion a safer distance from the scalp, typically between one half inch and one inch, reduces runoff and direct thermal acceleration at the scalp while still allowing the lotion to act on the hair shaft.

Bacteria are categorized by their morphology, which is critical for microbiological identification and treatment strategies. Cocci, being spherical, can form clusters (e.g., Staphylococcus) or chains (e.g., Streptococcus), with some causing infections like pneumonia or strep throat. Bacilli, with their rod-like structure, include beneficial species like Lactobacillus (used in yogurt fermentation) and pathogens like Escherichia coli (causing food poisoning). Spirilla, with their spiral shape, include harmless species like Spirillum volutans and pathogenic ones like Borrelia burgdorferi (Lyme disease). The question probes the general nature of these bacteria, which can range from symbiotic (aiding digestion) to pathogenic (causing disease), requiring a nuanced understanding of microbial ecology.

In cosmetology, a hair tint retouch, also known as a root touch-up or regrowth application, involves applying hair color specifically to the new growth of hair at the roots to maintain a consistent color appearance as the hair grows out from the scalp. This targeted approach prevents unnecessary re-coloring of the previously tinted lengths and ends, which could lead to over-processing, damage such as dryness, breakage, or uneven tone due to color buildup. The new growth typically emerges at a rate of about 1/2 inch per month, and retouches are recommended every 4-6 weeks depending on hair growth speed, natural color contrast, and client preferences. By focusing solely on the regrowth—usually 1/2 to 1 inch from the scalp—cosmetologists ensure color matching while preserving hair health, using techniques like sectioning the hair into quadrants, applying color with a brush for precision, and monitoring development time to achieve seamless blending. This method is essential for permanent, semi-permanent, or demi-permanent colors, where the goal is to cover grays or maintain vibrancy without compromising the mid-lengths and ends, which may require separate toning or glossing if faded. Factors like hair texture (fine hair shows roots faster), porosity (virgin regrowth absorbs color differently), and previous treatments influence the formula choice, often requiring a slightly adjusted shade or developer strength. Professional training emphasizes patch tests for allergies and strand tests for timing, ensuring safe, effective results that enhance client satisfaction and hair integrity over repeated services. In contrast, applying to hair ends risks darkening or dulling them, the entire shaft leads to unnecessary exposure, and hairline only ignores broader regrowth, making new growth the optimal focus for efficient, damage-minimizing retouches.

The hard rubber comb acts as a heat barrier so the iron does not contact skin, preventing scalp burns while still allowing close placement and tension. It is not for protecting hair, increasing glide, or preventing hair burning which is controlled by temperature and time.

To prevent unwanted splits, breaks, or visible separations in the finished hairstyle along the sensitive front or facial hairline, where hair is often finer and more prone to uneven blending due to growth patterns, cowlicks, or styling stress, triangular bases are recommended in pin curl techniques. The triangular shape of the base—formed by sectioning the hair into a three-sided partition—allows the curls to overlap seamlessly when combed out, creating a smooth, continuous flow that disguises potential gaps and maintains structural integrity. In contrast, square bases provide uniform volume but can lead to blocky appearances; circular bases offer rounded effects suitable for waves but may not blend as well at edges; and pivot curls focus on rotation rather than base shape for mobility. This approach is crucial in areas like the hairline, where natural contours demand precision to avoid a 'pieced-together' look, especially in updos, bobs, or vintage styles. Cosmetologists assess hair density and direction before sectioning, using clips to secure and ensuring even moisture for setting, which enhances hold and reduces breakage risks from tension. Triangular bases also accommodate facial framing, complementing bone structures like oval or heart-shaped faces, and are taught in foundational training to promote client confidence through flawless, natural finishes that withstand daily wear.

Nummular eczema causes red, round lesions with silver borders, usually itchy.

Skill in finger waving is crucial for cosmetologists as it serves as the foundation of styling, teaching essential techniques for manipulating hair shape, direction, and texture without relying on modern tools like curlers or irons. This method develops hand-eye coordination, precision in creating ridges and troughs, and an understanding of hair behavior under tension and moisture, principles that underpin advanced hairstyles such as updos, victory rolls, or contemporary waves. Unlike creating very tight waves (which is just one possible outcome), being easy to master (it's actually challenging and requires practice), or eliminating layers (it complements layering), finger waving builds core competencies in wet styling and sets the groundwork for creative expression in the field. Historically derived from Marcel waving but adapted for finger use, it emphasizes working with the hair's natural properties, helping professionals adapt to various hair types—from straight to wavy—and client needs, ultimately enhancing service quality, efficiency, and artistic capabilities in salon environments.

Effective listening ensures understanding client needs, improves communication and service.

Correct: Option C - On the upper lip.

Wearing gloves prevents the spread of infection from a chapped hand to the client and protects the skin.

Disinfection kills bacteria and viruses but not spores, according to CDC.

Correct: Option B - Hair breakage is a common result of tight fastening.

Hair removal methods address various dermatological conditions, each with specific indications. Hypertrichosis, excessive hair growth due to genetics or hormones, is effectively managed with waxing, shaving, electrolysis (permanent), and tweezing. Trichorrhexis nodosa involves hair shaft fragility, not excess growth. Pityriasis capitis simplex is dandruff, and androgenic alopecia is patterned hair loss, neither requiring removal techniques. The choice of method depends on hair type, skin sensitivity, and desired permanence, making this a practical application question.

Correct: Option a - Soften and swell - Relaxers break disulfide bonds, softening and swelling hair for straightening.

The matrix is the living tissue that produces the nail plate; its front visible portion appears as the lunula. The eponychium is the proximal fold cuticle area and the hyponychium is under the free edge.

Correct: Option d - Stabilizer - This neutralizes the relaxer and reforms bonds.

Thinning with scissors is commonly called slithering. This technique uses scissors or thinning shears at a shallow angle to remove bulk and create softer lines. Clipper over comb is a clipper technique, razor cutting uses a straight razor for texture and edge, and layer cutting builds length differences rather than specifically thinning.

Ring finger goes into fixed hole of scissors, ensures good control.

In cosmetology, when a hairstyle demands a high level of mobility, meaning the curls need to have significant movement, bounce, and flow away from the scalp for dynamic, voluminous looks such as cascading waves or updos with soft, swinging elements, the full-stem curl is the optimal choice. The stem in pin curls or roller sets refers to the section of hair between the scalp (base) and the first turn of the curl (circle), and its length directly dictates the curl's mobility: a no-stem curl sits flat against the scalp with minimal movement, ideal for sleek, close-to-head styles; a half-stem curl offers moderate mobility for balanced volume; while the full-stem curl, where the stem is as long as possible within the section, allows the curl to pivot freely from the base, providing maximum swing and liveliness. This technique is particularly useful in creating hairstyles that require natural-looking motion, like beach waves or formal styles with hanging tendrils, as it leverages the hair's natural elasticity and gravity for enhanced aesthetics. Cosmetologists must consider hair type—fine hair may need shorter stems to avoid limpness, while thick hair benefits from full stems for control—along with factors like face shape, occasion, and client preferences to ensure the mobility enhances rather than overwhelms the overall look. Historical styles from the 1920s flapper era to modern red-carpet appearances often incorporate full-stem curls for their versatility, and proper setting with pins or rollers, combined with products like mousse or hairspray, ensures longevity without sacrificing movement. Mastering stem variations builds foundational skills in wet and dry setting, enabling professionals to adapt to diverse textures, lengths, and trends while minimizing damage through even tension distribution.

Correct: Option D - Height

Excessive cleaning of hyponychium (skin under nail tip) causes tearing, pain, easy infection.

Correct: Option b - Hard press - Double heated comb treatment for full straightening.

Correct: Option B - Porosity.

To prevent overlapping in a tint retouch, which can cause uneven color, banding, darkening, or damage from over-processing the previously colored hair, cosmetologists apply the tint to the new growth while leaving a small gap—typically about 1/2 inch—before reaching the line of demarcation where the old color begins. This technique allows for precise application to the regrowth area, followed by a brief feathering or combing in the final minutes of processing to blend seamlessly without direct overlap. The 1/2 inch 'up to' distance ensures a buffer zone, accounting for color expansion during development and minimizing risks like breakage or hot roots (where roots appear lighter due to scalp heat). In practice, hair is sectioned finely (1/8 to 1/4 inch parts), color applied from scalp outward stopping short, and timing adjusted based on hair type—darker or resistant hair may need longer processing. This method is crucial for maintaining hair health over multiple retouches, as repeated overlap weakens the cortex by breaking disulfide bonds excessively. Alternatives like 1/16 inch over or 1/4 inch over involve intentional overlap, risking buildup, while 1/16 inch up to is too close and prone to accidental overlap during application. Professional guidelines from sources like Milady's Standard Cosmetology emphasize this gap for optimal results, adapting for factors like growth rate (faster in summer), gray percentage, or previous lightening, ensuring natural-looking, long-lasting color that clients can maintain at home with root concealers between salon visits.

Correct: Option A - Less heat and less pressure

Correct: Option D - Help prevent hair from burning or scorching

Correct: Option B - Under development product

The two main types of hair fillers in cosmetology are conditioning fillers and color fillers, where conditioning fillers are protein-based treatments that repair and equalize porosity by filling in damaged areas of the cuticle and cortex, improving elasticity and moisture retention, while color fillers deposit pigment to create a uniform base, preventing uneven absorption during subsequent tinting or darkening processes. Color fillers are particularly vital when going three or more levels darker to avoid green or muddy tones by reintroducing missing warm undertones like red or gold, using semi-permanent dyes mixed with low-volume developer for gentle application. Unlike cream fillers (a form but not a type category), toner fillers (for post-lightening), or process fillers (not standard), these address porosity variations caused by sun, heat, or chemicals, ensuring predictable color results. Application involves strand tests, sectioning, and 20-30 minute processing, often with brands like Wella or Redken offering specialized products. Dermatologists and stylists recommend them for damaged or over-processed hair, combining with Olaplex for bond repair, and they can be used in foils or globally. This classification from Milady's textbook aids in color correction, like filling brassy highlights, promoting healthy transitions and client education on maintenance with protein masks to sustain even porosity and vibrant, long-lasting color without breakage or fading.

Oily skin is due to sebaceous glands producing too much oil, from genetics, hormones or improper care.

Tapering and thinning remove bulk and weight from the hair shaft, lowering resistance to shape and allowing waves or finger wave patterns to hold more easily. Heavy, blunt hair resists molding because mass pulls styles down, so tapered and thinned hair is generally easier to wave and style.

Cuticle is the epidermis around nails, protects from bacteria, needs careful care.

Chemically relaxed curly hair can become fragile and prone to breakage. Scissors offer the most controlled, gentle cutting action and allow the stylist to remove damage safely with precise sectioning and point cutting. Clippers or razors can exert more mechanical stress or slicing action that may worsen fragile hair condition.

Medium-grit file removes natural oils, increases adhesion for glue.

A semi-permanent tint contains certified colors, which are FD&C-approved direct dyes that deposit color on the hair's surface and within the cuticle without requiring oxidation or penetration into the cortex, providing temporary to medium-lasting hues that fade gradually over 4-28 shampoos depending on hair porosity and care. These certified colors, regulated for safety by bodies like the FDA, include acid or basic dyes such as nitro compounds or anthraquinones, ensuring minimal damage as they lack ammonia or high-volume peroxide, making them ideal for toning, gray blending, or color refreshment on all hair types. In contrast, compound henna is a natural vegetable dye for coating; aniline derivatives like PPD are oxidative agents in permanent tints that require developer for deep penetration and longevity; and metallic dyes build color progressively but can cause incompatibilities. Formulations often include conditioning agents like cetearyl alcohol or amodimethicone for shine and softness, with pH-balanced to seal cuticles. Cosmetologists select semi-permanent for clients seeking low-commitment changes, applying after shampooing with development times of 10-30 minutes, and advising on sulfate-free maintenance to prolong vibrancy. Historical evolution from coal-tar dyes to safer synthetics underscores their popularity in modern lines like L'Oreal or Madison Reed, which avoid harsh chemicals, promoting healthy, vibrant results without lifting natural pigment or causing allergic reactions common with permanents.

These methods are used to remove unwanted hair, often linked to conditions like hirsutism or hypertrichosis.

Correct: Option D - Diameter of the rollers.

This condition involves inflammation around the nail, often due to infection, trauma, or irritation. Onychatrophia refers to nail atrophy or wasting, Onychia to nail bed inflammation, Paronychia to the specific inflammation of the surrounding tissue (commonly caused by bacteria or fungi), and Onychoptosis to nail shedding. Paronychia is distinguished by its location and frequent association with swelling or pus, making it a key diagnosis in nail care and cosmetology.

Frequent strand test checks if hair has absorbed enough dye.

A chap (fissure) on the hand risks infection transmission to clients and self. Wearing gloves creates a barrier, continuing work increases risk, and stopping work disrupts service. Protective cream may soothe but doesn't fully protect, making gloves the safest, most professional choice per occupational health standards in cosmetology.

When hair is resistant, it means the cuticle layer is very tight, making it difficult for color or tint to penetrate evenly.

Before tinting, you want to even out the porosity so the color absorbs uniformly along the hair shaft.

Why “Cream or oil bleach” is correct:

Cream or oil bleach can be used as a pre-softening or pre-lightening treatment.

It slightly lifts (opens) the cuticle layer without fully bleaching the hair.

This makes the hair more porous and receptive to color, ensuring that tint or dye will take evenly.

Correct: Option B - 12.5% is the correct percentage based on standard dilution.

Minimum pressure maintains curly hair structure, avoids temporary straightening.

Damaged nails are prone to fungus due to weak structure, easy infection.

After carefully trimming a hangnail, cuticle oil softens and rehydrates the surrounding skin, reducing splitting and the chance of infection. Naphtha soap is harsh, boric acid is an antiseptic not an emollient, and polish remover dehydrates tissue.

Traditional nail whitener is a paste applied under the free edge to create an opaque white appearance and stay in place during wear. Liquids and oils lack sufficient hiding power, and loose powder does not adhere without a binder.

Correct: Option D - 10 major color changes.

Correct: Option D - The side of the head

Notifying before leaving shows responsibility and respect for the salon owner.

Neutralizer stops the chemical reducing action by re-oxidizing the broken disulfide bonds and reforming them into their new curled shape. It effectively 'rebonds' or 'locks in' the curl pattern established by the waving solution. Relaxing curled hair would undo the wave, and softening or closing the cuticle are secondary outcomes but not the main chemical purpose.

Tweezers attach false lashes to real lashes accurately and safely.

Correct: Option A - Oxidation

Egyptian henna, derived from the Lawsonia inermis plant, colors the hair by coating the hair shaft with lawsone molecules that bind to the keratin proteins on the exterior, creating a semi-permanent layer that adds reddish tones while conditioning and strengthening the hair without penetrating deeper structures. This coating mechanism provides a natural, translucent color that builds over applications, enhancing shine and thickness but allowing the underlying pigment to show through for multi-dimensional effects. Unlike penetrating methods that alter the cuticle or cortex, henna's external adhesion minimizes damage, making it suitable for sensitive scalps or damaged hair, with results lasting 4-6 weeks depending on porosity and washing frequency. Traditional use in ancient Egypt for body art and hair extended to modern cosmetology for organic alternatives, often mixed with indigo or cassia for varied shades like copper or auburn. Cosmetologists must perform strand tests due to variability in henna quality (body art vs. compound), ensuring no metallic salts are present to avoid reactions with other chemicals. This non-oxidative process requires longer development (1-3 hours) under heat, and while it coats the entire shaft, it doesn't lift color, limiting use on dark hair to subtle warmth. Benefits include UV protection and anti-fungal properties, but removal is challenging, emphasizing client education on commitment and aftercare like sulfate-free shampoos to preserve the coating.

Correct: Option A - The firmness of the curl

Correct: Option c - Mantle - The mantle refers to the proximal nail fold, which is skin, not part of the nail itself.

Freedom backwards texturizes backward creating natural, comfortable hair ends.

Correct: Option A - Shampooed

The primary structural component of hair, nails, and the outer skin layer (epidermis) is keratin, a tough, fibrous protein that provides strength and protection. Hemoglobin is a blood protein, melanin is a pigment, and calcium is a mineral, none of which form the bulk of these tissues. Keratin's cross-linked structure, rich in cysteine, enables its durability, making it essential for understanding skin and appendage biology in cosmetology.

Losing around 35 to 40 hairs per day is within the normal range of the hair growth cycle, where telogen effluvium or daily shedding occurs as part of the anagen (growth), catagen (transition), and telogen (resting) phases, but statistics indicate that approximately 40% of both men and women experience some noticeable degree of hair loss by age 35, often due to androgenetic alopecia influenced by genetics, hormones like DHT, stress, diet, or medical conditions. This figure combines male pattern baldness, which affects about 66% of men by 35 with receding hairlines or crown thinning, and female pattern hair loss, impacting around 40% of women with diffuse thinning, reflecting a blended average. Factors such as ethnicity, lifestyle, and environmental exposures accelerate onset, with early intervention through minoxidil, finasteride, or scalp treatments potentially halting progression. Cosmetologists play a role in early detection during consultations, recommending volumizing styles or products to camouflage thinning while advising medical referrals for underlying issues like thyroid disorders or nutritional deficiencies, fostering client education on preventive care like gentle handling and balanced nutrition to maintain hair health into later decades.

Draping protects clothing, increases comfort and relaxation, according to spa standards.

Household bleach (sodium hypochlorite) is an effective disinfectant, diluted according to EPA.

Correct: Option a - A filler applied to the pigmented hair - Filler helps even out porosity for better tint uptake.

Yellow is considered the lightest of the primary colors (red, blue, yellow).

Sensitive skin is easily irritated by chemicals, temperature, or products, needs gentle care.

<div>Explanation:</div><div>During a permanent wave (perm) process, the solution can drip and saturate the cotton band placed around the client’s hairline. If this cotton becomes too wet, it can allow the chemicals to run down onto the skin, causing chemical burns or irritation.</div><div><br></div><div>Therefore, the technician should:</div><div>Remove and replace the saturated cotton band immediately to prevent chemical contact with the skin.</div><div><br></div><div>(Optional additional step): Applying a protective base (barrier cream) around the hairline before starting the process also helps, but the key action during the process to avoid chemical burns is removing the saturated cotton band.</div>

Proper handwashing time is at least 20 seconds to remove dirt, oils, and most transient microorganisms effectively. This is a standard hygiene guideline in both cosmetology and healthcare settings to maintain sanitation. Less time may not adequately break down and rinse away contaminants.

Correct: Option B - Diameter of the rollers has the most significant impact on curl tightness.

Aniline derivative tints, including para-phenylene-diamine (PPD), a key oxidative agent used in permanent hair colors for its ability to penetrate the cortex and form large color molecules with hydrogen peroxide, are also referred to as synthetic organic tints, distinguishing them from natural or inorganic alternatives due to their chemically synthesized aromatic amine structure derived from aniline. These tints offer long-lasting, vibrant shades with excellent gray coverage but require patch tests for allergies, as PPD can cause reactions in sensitive individuals. Unlike vegetable tints from plant extracts like henna for temporary hues; metallic dyes with metal salts for progressive coloring; or compound dyes mixing types; synthetic organic tints dominate modern color lines for their versatility in lifting and depositing color. Cosmetologists must follow manufacturer guidelines, considering hair porosity and previous treatments to avoid damage, while regulations like EU limits on PPD concentrations ensure safety. This classification underscores their role in professional salons for customizable, durable results that evolve with trends in fashion and personal expression.

Communicable disease spreads through direct or indirect contact, according to CDC.

Masks often include ingredients to detoxify and stimulate. Fuller earth (clay) absorbs oil and removes dead cells while stimulating circulation, zinc oxide soothes but lacks drawing action, and chamomile calms without significant absorption. The clay's adsorbent properties and mild exfoliation make it ideal for oily skin treatments in cosmetology.

Hacking is strong massage, causes pain, not relaxing.

Skin without oil is dry skin, easily flaky, tight, irritated.

Hair growth cycles through three distinct phases: anagen (active growth), catagen (transitional regression), and telogen (resting phase, where hair is shed). Telogen is the final phase, preparing the follicle for a new anagen cycle. Transition and growth phases are part of anagen or overall development, not distinct stages, making telogen the correct completion of the cycle, a fundamental concept in trichology and hair care.

Parasites depend on a living host for nutrients and reproduction which fits pathogenic bacteria that grow only in living tissue. Pimples boils and pus are conditions or byproducts of infection not organisms.

Massaging infected skin can spread bacteria or worsen the condition, so it is prohibited in cosmetology practices.

Correct: Option D - Red.

Correct: Option C - Water