KY Esthetician key terms

Microorganisms that cause disease in humans. In the salon they include staphylococci, streptococci, and Pseudomonas, and they are the reason implements and hands must be cleaned and disinfected between clients.

A process that destroys most harmful microorganisms on hard, nonporous surfaces and implements, but not necessarily bacterial spores. In Kentucky salons it is required for items such as tweezers, comedone extractors, and reusable spatulas after each client.

The complete destruction of all microbial life, including bacterial spores, usually by autoclave or dry heat. Estheticians rarely sterilize, but must know that disinfection is a lower level of protection than sterilization.

A product carrying an Environmental Protection Agency registration number and labeled as a hospital-grade tuberculocidal disinfectant. Kentucky rules require implements to be immersed or wiped with such a product, used according to label directions and contact time.

The number of minutes a disinfectant must stay wet on a surface or implement to kill the organisms listed on its label. Cutting the time short means the item is not actually disinfected, even if it looks clean.

The presence of dirt, oil, blood, or infectious organisms on a surface, tool, or the hands. Anything contaminated must be cleaned before it can be effectively disinfected, because soil blocks disinfectant contact.

The practice of treating all blood, body fluids, and non-intact skin as potentially infectious regardless of a client's appearance or stated health status. It drives glove use, handwashing, and safe handling of soiled linens and sharps.

A device that sterilizes implements using pressurized steam at high temperature. Items must first be cleaned and dried, and packaged or pouched before cycling, to achieve true sterilization.

The outermost, avascular layer of the skin. It is composed of keratinocytes in five layers where present, provides the barrier against water loss and microbes, and contains melanocytes that produce pigment.

The outermost layer of the epidermis, made of flattened, dead keratin-filled cells surrounded by lipids. It controls water loss and absorption, and most topical exfoliants and moisturizers act here first.

The layer beneath the epidermis that holds collagen and elastin fibers, blood vessels, nerves, hair follicles, sebaceous glands, and sweat glands. It gives skin strength and elasticity and supplies the epidermis with nutrients.

A tough, fibrous protein that fills skin cells as they mature and move outward. It makes the stratum corneum water-resistant and is the main component of hair and nails.

A cell in the basal layer of the epidermis that produces melanin and transfers it to surrounding keratinocytes. Melanin gives skin its color and provides some protection from ultraviolet radiation.

The pigment produced by melanocytes that determines skin, hair, and eye color. Its production increases with sun exposure, and uneven distribution contributes to hyperpigmentation and post-inflammatory marks.

A gland attached to a hair follicle that secretes sebum onto the skin surface. Sebum lubricates skin and hair, and overactivity contributes to oily skin, comedones, and acne.

The oily substance produced by sebaceous glands. It helps retain moisture and protect the barrier, but excess sebum combined with dead cells can plug follicles and feed acne-causing bacteria.

The main structural protein of the dermis, forming a supportive network that gives skin firmness. Production declines with age and sun damage, which contributes to fine lines and laxity.

A protein in the dermis that allows skin to stretch and return to shape. Sun damage and aging degrade elastin fibers, leading to sagging and deep wrinkles.

The passive movement of water out of the skin through the epidermis into the air. High water loss signals a weakened barrier and results in tightness, flaking, and sensitivity; occlusive ingredients and barrier lipids reduce it.

A classification of skin based on its oil and water balance, usually described as normal, dry, oily, or combination. Type is largely genetic and stable, and it guides product texture choices rather than treating a condition.

A temporary or treatable state of the skin such as dehydration, sensitivity, acne, or hyperpigmentation. Conditions can change over time and must be distinguished from type before selecting products or treatments.

A six-level classification of skin based on color and its response to ultraviolet exposure, from very fair that always burns to deeply pigmented that rarely burns. It guides sun protection advice and treatment intensity.

A plugged hair follicle. An open comedo is a blackhead with an oxidized dark surface; a closed comedo is a whitehead covered by skin. Both are noninflammatory acne lesions and are not to be picked or squeezed.

Darkened skin left after inflammation or injury, such as an inflamed pimple or aggressive extraction. It is more common in deeper skin tones and is managed with sun protection and gentle care rather than harsh scrubbing.

The structured conversation and assessment before a service that covers goals, health history, medications, allergies, prior treatments, and skin analysis. It establishes informed consent, identifies contraindications, and documents the treatment plan.

A condition or circumstance that makes a treatment unsafe or inadvisable, such as active infection, recent chemical peel, isotretinoin use, or pregnancy for certain ingredients. Identifying it during consultation protects the client and the licensee.

The client's voluntary agreement to a service after being told what it involves, its expected results, risks, and alternatives. Consent should be obtained and documented before treatment, and it may be withdrawn at any time.

A small application of a product, such as a wax or dye, on a limited area to check for an allergic reaction before full treatment. It is especially important for first-time waxing or tinting clients.

The active growth stage of the hair cycle, when the hair bulb is attached to the blood supply and the shaft is most firmly rooted. Waxing during anagen is more effective but can be more uncomfortable.

The resting stage of the hair cycle, when the hair detaches from the follicle and is shed. Waxing removes telogen hairs easily, which is why regrowth appears sooner after some treatments.

The repeating sequence of anagen growth, catagen transition, and telogen rest that every follicle follows independently. Understanding the cycle explains why waxing must be repeated on a schedule to catch hairs in the right phase.

A wax that sets firm and is removed without a strip, gripping only the hair and not the skin. It suits sensitive areas and coarse hair and is generally gentler than soft wax.

A thin, sticky wax applied in the direction of hair growth and removed with a cloth or paper strip against the growth. It requires careful technique because it adheres to skin as well as hair.

Reinserting a used applicator into a wax pot after it has touched a client's skin. It is a contamination risk and is prohibited practice; single-use applicators or clean spatulas are used instead.

Selecting a foundation whose undertone and depth match the client's skin at the jawline in natural light. Testing on the jaw rather than the hand prevents a visible line between face and neck.

The underlying hue of the skin, described as warm, cool, or neutral, independent of surface color. Correct undertone matching keeps foundation and concealer from looking orange, ashy, or gray.

The study of how colors relate, including primary, secondary, and complementary pairs. Estheticians use it to neutralize redness with green, correct dark circles, and choose flattering makeup shades.

A scale from 0 to 14 measuring acidity or alkalinity, with 7 neutral. Healthy skin surface pH is mildly acidic near 4.5 to 5.5, and products far outside that range can disrupt the barrier.

The slightly acidic film of sebum, sweat, and skin lipids on the surface that helps inhibit harmful microbes and supports barrier function. Alkaline cleansers can strip it and leave skin tight and vulnerable.

An ingredient such as glycerin or hyaluronic acid that attracts and holds water in the upper skin layers. Humectants hydrate but need an occlusive on top in dry conditions to prevent pulling moisture out.

An ingredient that forms a film on the skin surface to slow water loss, such as petrolatum, dimethicone, or lanolin. Occlusives are used for dry or compromised barriers and after treatments.

An ingredient that softens and smooths skin by filling spaces between surface cells, such as fatty alcohols, esters, and plant oils. Emollients improve texture and flexibility rather than adding water.

The state body that licenses estheticians, salons, and schools and enforces Kentucky cosmetology statutes and administrative regulations. Candidates should know its licensing, sanitation, and scope-of-practice requirements.

The legally permitted services and techniques for an esthetician license. Working outside it, such as performing medical treatments reserved for physicians, can lead to discipline or license loss.

The state-issued authorization to practice esthetics after meeting education, examination, and application requirements. Kentucky licenses must be displayed and renewed on schedule, and lapsed practice is unlawful.