Beauty Therapy key terms

A client's voluntary agreement to a treatment after being told its purpose, what it involves, likely results, possible risks, alternatives, and their right to stop at any time. It must be documented before work begins.

The legal and ethical obligation to act in a client's best interests, avoiding harm through competent practice, safe equipment, accurate advice, and referral when a condition is outside your scope of training.

The treatments and techniques a therapist is trained, qualified, and insured to perform. Working outside it, such as diagnosing skin disease or using equipment without certification, breaches professional and insurance requirements.

Directing a client to a doctor, dermatologist, or other appropriate professional when a condition, medication, or symptom needs medical assessment. Referral protects the client and keeps the therapist within their legal and professional limits.

A confidential document holding consultation answers, skin analysis findings, products and settings used, consent signature, and treatment dates. It supports continuity of care and provides evidence if a complaint or insurance claim arises.

The duty to collect only necessary personal and health information, store it securely, share it only with the client's permission or where the law requires, and retain or destroy records according to local privacy law.

A condition, medication, or circumstance that makes a treatment inadvisable, either completely (absolute) or with modification (relative). Examples include active infection, recent isotretinoin use, or pregnancy for certain modalities.

A small controlled application of a product, usually on the inner forearm or behind the ear, assessed after 24 to 48 hours to detect sensitisation before a full treatment such as tinting or lash adhesive use.

The sequence by which infection spreads: infectious agent, reservoir, exit portal, mode of transmission, entry portal, and susceptible host. Breaking any single link prevents transmission in a salon setting.

Routine practices applied to every client regardless of known infection status, including hand hygiene, gloves, protective clothing, safe sharps handling, and correct cleaning of surfaces and equipment between clients.

Transfer of microorganisms from one person, surface, or object to another, for example by double-dipping a spatula, reusing a file, or touching a contaminated trolley with gloved hands.

Using a chemical agent to reduce pathogenic microorganisms on inanimate surfaces and tools to a level considered safe. It differs from sterilisation, which destroys all microorganisms including spores.

A process that destroys all microorganisms, including bacterial spores, on reusable tools such as metal extractors or nail nippers. It is required where tools may contact blood or broken skin.

A product or tool designed to be used once and then discarded, such as disposable files, spatulas, lash applicators, or needles. Reusing it risks cross-contamination and may breach regulations.

Placing used blades, needles, or broken glass into a rigid, puncture-resistant, labelled container that is sealed and collected by an approved waste service, never into general rubbish or soft bags.

The outer avascular layer of skin, composed mainly of keratinocytes, which renews itself roughly every four weeks. Its barrier function limits water loss and blocks chemicals and microorganisms.

The outermost dead layer of flattened, keratin-rich cells embedded in a lipid matrix. It provides the main barrier to water loss and penetration, and its condition determines how hydrated and smooth skin looks.

The vascular middle layer of skin containing collagen and elastin fibres, fibroblasts, nerves, glands, and hair follicles. It provides strength, elasticity, sensation, and nourishment to the epidermis above.

A structural protein forming strong fibres in the dermis that give skin its tensile strength. Production declines with age and sun exposure, contributing to thinning and wrinkle formation.

A protein in the dermis that allows skin to stretch and recoil. Degradation and reduced production over time, accelerated by ultraviolet light, lead to sagging and loss of firmness.

A pigment produced by melanocytes in the basal epidermis that gives skin and hair colour and absorbs ultraviolet radiation. Uneven distribution causes pigmentation disorders such as melasma or post-inflammatory marks.

The repeating phases of a hair follicle: anagen (active growth), catagen (transition), and telogen (rest and shedding). Only anagen hairs respond well to waxing or electrolysis, which affects appointment timing.

The active growth stage of a hair follicle, when the hair is anchored deepest and contains pigment. Hair removal during this phase gives the longest-lasting result because the root is fully formed.

A stable classification of skin based mainly on oil production and hydration, commonly normal, dry, oily, and combination. It guides product choice and treatment frequency rather than describing a medical condition.

A temporary or ongoing state that can change over time, such as dehydration, sensitivity, acne, or ageing. Unlike skin type, a condition may be treatable, modifiable, or require referral.

Systematic assessment of the client's skin under suitable lighting, using observation, palpation, and questioning to identify type, condition, and any areas needing modification or referral before treatment.

An ultraviolet lamp used during skin analysis to reveal fluorescence patterns from sebum, bacteria, or pigment, helping identify oily areas, dehydration, or possible infection. It supports but does not replace medical diagnosis.

A six-point classification of skin phototype based on colour and response to ultraviolet exposure, used to estimate burning and tanning tendency and to plan safe waxing, laser, or peeling parameters.

Removing makeup, sebum, sweat, and environmental debris from the skin using a product suited to the client's type. It is the first step of any facial and prepares skin for exfoliation and treatment products.

Removing dead cells from the stratum corneum by mechanical means such as scrubs and brushes, or chemical means such as alpha hydroxy acids. Overuse damages the barrier and causes irritation or sensitivity.

The named manual strokes used in facial and body work, including effleurage, petrissage, tapotement, and friction. Direction, pressure, and rhythm are chosen to relax, stimulate circulation, or drain tissue.

A smooth, gliding stroke performed with relaxed hands at consistent pressure, usually following the direction of venous and lymphatic flow. It begins and ends most massage routines and links other movements.

A light, rhythmic technique using gentle directional strokes to encourage lymph movement through vessels toward lymph nodes. It is used for puffiness and fluid retention and requires caution in certain medical conditions.

Removing hair from the root by applying warm or hot wax to the skin, allowing it to set, then removing it against the direction of hair growth while supporting the skin to reduce discomfort and trauma.

A sac-like structure in the dermis from which a hair grows, containing the root, bulb, sebaceous gland, and tiny muscle. Its depth and phase determine how effectively waxing or electrolysis removes hair.

The visible hard keratin structure covering the nail bed, produced by the matrix. Its surface, colour, and curvature are assessed during manicure, and changes may indicate trauma, infection, or systemic disease.

The living tissue at the base of the nail that produces new nail cells. Damage to the matrix causes permanent ridges, splitting, or distortion, so tools must never be pushed into or cut from this area.

The thin layer of dead skin sealing the base of the nail plate against the skin. It protects the nail matrix from infection and should be softened and gently pushed back, not cut aggressively.

Separation of the nail plate from the nail bed, leaving a white or discoloured gap. It can follow trauma, aggressive filing, or infection and is a reason to avoid further nail services until assessed.

Inflammation or infection of the skin around the nail, showing redness, swelling, and tenderness. It is contagious and a contraindication to manicure until treated, so the client should be referred.

The asynchronous cycle of eyelash follicles, with growth phases lasting weeks and resting phases longer. Because lashes are at different stages, extensions are applied to individual hairs and shed naturally over time.

A small application of cyanoacrylate adhesive, usually behind the ear or on the inner arm, checked after 24 to 48 hours before lash extensions. It identifies clients at risk of allergic reaction.

A circular arrangement of hues used to select complementary, analogous, and contrasting colours. Makeup artists use it to neutralise redness with green, correct dark circles with peach, and build harmonious looks.

The underlying warm, cool, or neutral cast of a person's skin that stays constant regardless of surface colour or tan. Matching foundation undertone prevents a mask-like or ashy result.

Neutralising an unwanted hue on the skin, such as redness, bruising, or sallowness, by applying a complementary colour beneath foundation. Green cancels red, peach cancels blue, and lavender brightens yellow tones.

Premature skin ageing caused by cumulative ultraviolet exposure, producing wrinkles, laxity, uneven pigmentation, and capillary damage. It is largely preventable through sunscreen and sun avoidance.

Passage of water from inside the skin through the stratum corneum into the air. Raised loss indicates a compromised barrier and results in tightness, flaking, and increased sensitivity.

An ingredient such as glycerin or hyaluronic acid that attracts and holds water in the upper skin layers. It improves hydration but needs an occlusive layer in dry conditions to prevent further water loss.

An ingredient such as petrolatum or certain oils that forms a film on the skin surface, slowing water loss. Occlusives support a damaged barrier and are useful for very dry or irritated skin.

A stable mixture of oil and water held together by an emulsifier, forming the base of most creams and lotions. The ratio and droplet size influence texture, absorption, and suitability for different skin types.

A molecule with water-loving and oil-loving ends that allows oil and water to mix and lifts grease from skin. It is the active principle in cleansers and shampoos and can strip skin if too harsh.

A water-soluble acid such as glycolic or lactic acid that loosens bonds between dead cells, promoting exfoliation and smoother texture. Concentration, pH, and skin sensitivity determine its effect and risk.

A delayed hypersensitivity reaction producing redness, itching, swelling, or blistering where a substance touched the skin. It may appear hours or days later and requires the product to be stopped and the client referred.

A gland in the dermis, usually attached to a hair follicle, that secretes sebum onto the skin surface. Its activity level largely determines whether skin behaves as oily, dry, or combination.

An oily substance secreted by sebaceous glands that lubricates skin and hair and helps maintain the barrier. Excess sebum contributes to congestion and acne, while too little leaves skin dry and tight.

A tough fibrous protein forming the main structural material of the stratum corneum, hair, and nails. Its arrangement and hydration determine skin smoothness and the strength and flexibility of hair and nails.

Darkening of skin after inflammation or injury, such as an acne lesion, waxing trauma, or aggressive extraction. It is more common in deeper skin tones and is managed with sun protection and gentle care.