3.5 Contagious Diseases, Inflammations & Lesions

Contagious Conditions: The Automatic Stop List

Some conditions are contagious enough that the correct professional response is always the same: do not perform the service, protect other clients, and refer the person to a physician. The theory exam tests recognition of these conditions by description because a candidate who cannot identify them by symptom cannot be trusted to apply the rule correctly in practice.

• Conjunctivitis (pink eye) is a contagious inflammation of the membrane covering the eye, causing redness, discharge, and irritation. Any eye-area service, including lash and brow work, is contraindicated until it has fully cleared.
• Herpes simplex (cold sores, fever blisters) is a viral infection that produces clusters of fluid-filled blisters, most often around the mouth. It is contagious through direct contact during an active outbreak and is a contraindication for facial services in the affected area until the lesion is fully healed.
• Tinea (ringworm) is a fungal infection producing ring-shaped, scaly, sometimes itchy patches. Despite the name, no worm is involved; the fungus is contagious through direct or indirect contact, and the client should be referred rather than serviced.
• Pediculosis (lice) and scabies (a mite infestation causing intense itching and a characteristic burrow-track rash) are both contagious infestations requiring referral and, in a salon or spa setting, careful attention to tool and linen sanitation.
• Verruca (warts) are caused by the human papillovirus and are contagious through contact; some estheticians may still perform limited services around a wart depending on state rules and location, but active or spreading verrucae generally warrant caution and referral.
• Impetigo is a contagious bacterial skin infection producing honey-colored crusted sores, most often seen in children but possible in adults; it is a clear contraindication for service.

Inflammatory Conditions: Judgment, Not Automatic Refusal

A second group of conditions is inflammatory rather than contagious. These require judgment about severity, trigger avoidance, and whether gentle service can proceed or the client should be referred first.

• Dermatitis is a general term for inflammation of the skin, commonly split into allergic contact dermatitis (an immune reaction to a specific allergen, such as a fragrance or preservative) and irritant contact dermatitis (direct chemical or physical irritation, such as from a product left on too long). Identifying the trigger and removing it from the client's routine is central to managing either type.
• Eczema (atopic dermatitis) is a chronic, often hereditary inflammatory condition producing dry, itchy, red patches that can crack or weep during flares. Services on actively flaring eczema should be gentle, fragrance-free, and barrier-supportive, or postponed during a severe flare.
• Psoriasis is a chronic autoimmune condition producing thick, red patches covered with silvery-white scales, most often on the elbows, knees, and scalp, though it can appear elsewhere. Psoriasis is not contagious, but active plaques are typically avoided during exfoliating or extraction-based services because manipulation can trigger a flare (the Koebner phenomenon).
• Rosacea is a chronic vascular and inflammatory condition producing facial redness, visible dilated capillaries (telangiectasia), and sometimes papules and pustules that can resemble acne. Rosacea is triggered by factors such as heat, sun exposure, spicy food, alcohol, and certain skin-care ingredients; services should favor cooling, calming, low-irritation approaches and avoid known triggers rather than aggressive extraction or high-heat steam.

Primary Lesions: The First Sign Of Change

A lesion is any visible abnormality of the skin. Primary lesions are the first sign of a change and have not yet been altered by scratching, healing, or infection.

Secondary Lesions: What Develops Afterward

Secondary lesions develop as a primary lesion changes, heals, or becomes damaged.

Turning Vocabulary Into A Referral Decision

Consider a client whose intake form should read: "small cluster of vesicles on the upper lip, tender to touch." That description alone (vesicles, tender, upper-lip cluster) is consistent with an active herpes simplex outbreak, which is an automatic no-service situation until the area has fully healed. Compare that with a note reading "flat, brown macules across both cheeks, no tenderness, no change in texture," which points toward a pigmentation concern rather than a contagious or inflammatory lesion — a very different, and generally serviceable, scenario covered in the next section. Precise lesion language is what allows two different estheticians reading the same chart to reach the same, correct scope-of-practice decision.