13.2 Skin Conditions and Disorders

Skin Conditions and Disorders

Exam Focus: The lesion vocabulary is directly examined, and the professional value of learning it is precision in describing what you see without diagnosing it. Learn which conditions absolutely contraindicate a service — active herpes simplex, open or weeping lesions, inflamed acne, contagious conditions — and remember that the correct action is always modify, refuse or refer.

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1. Why a Cosmetologist Studies Disease at All

The purpose of this subject is not to make you a diagnostician. It is the opposite. New York draws a hard line between appearance enhancement and medicine, and the lesion vocabulary exists so that you can describe accurately what you observe, decide whether a service is safe, and refer — without ever naming a disease or offering a treatment.

19 NYCRR § 160.27(c) states the rule directly: no appearance enhancement licensee is authorised to diagnose or treat diseases, including diseases of the skin, hair and nails, and a business owner may not permit the practice of medicine at the business location without appropriate licensure. There is no informed-consent form, waiver or client request that creates an exception.

The Department of State enforces this actively. DOS has issued consumer warnings about "med spa" services and publishes a procedure licensure chart drawing the line between appearance enhancement and medical practice. Procedures DOS treats as medical — outside the cosmetology licence no matter who asks — include injectables such as neuromodulators and dermal fillers, microneedling, skin tag or lesion removal, laser procedures other than laser hair removal, high-intensity focused ultrasound and other energy-based body treatments, plasma treatments, medium and deep chemical peels, and IV or pharmaceutical therapies. DOS's own framing is the sentence worth memorising: even a "non-invasive" procedure may be a medical procedure requiring a professional licence. Enforcement decisions have imposed penalties on licensees who performed microneedling and skin tag removal in a salon setting.

Two neighbouring subdivisions of the same regulation complete the boundary and are examined alongside it:

• § 160.27(b) — an appearance enhancement licensee may not practise massage as defined by Education Law § 7801, but light massage of the surface layers of soft tissue for the purpose of beautification is permitted. Facial manipulations during a cleansing facial are within scope; therapeutic or deep tissue work is not.
• § 160.27(a) — micropigmentation and permanent make-up sit outside the appearance enhancement licence, though the sanitation standards still apply where the work is performed in an appearance enhancement business.

Everything that follows is therefore organised around three verbs: modify, refuse, refer. None of them requires you to know what the condition is called.

2. How Lesions Are Classified

A lesion is any structural change in tissue caused by injury or disease. The examinable split is between primary and secondary lesions.

Primary lesions are the first change from normal skin — they arise directly from the disease process. Secondary lesions develop later, from a primary lesion that has been scratched, has become infected, has healed, or has run its course. A scab is never a primary lesion; a blister is never a secondary one. Questions are often phrased as "which of the following is a secondary lesion?", so learn the two lists as lists.

Three physical properties separate the primary lesions from one another, and a question can be answered from these alone:

• Flat or raised? A macule is flat; everything else on the list is raised.
• Solid or fluid-filled? A papule and a nodule are solid; a vesicle, bulla and pustule contain fluid.
• What kind of fluid, and how large? A vesicle holds clear fluid and is small — under about a centimetre; a bulla is the same thing larger; a pustule holds pus. A wheal is a transient raised swelling from fluid in the dermis, as in a hive.

Primary lesions

Secondary lesions

The distinction between a hypertrophic scar, which stays within the boundary of the original wound, and a keloid, which grows beyond it, matters commercially as well as clinically: a client with a keloid history is a client for whom any service that abrades or traumatises skin — aggressive extraction, vigorous brushing, waxing over inflamed skin — carries a disproportionate risk.

3. Sebaceous and Sudoriferous Gland Disorders

The sebaceous (oil) glands and sudoriferous (sweat) glands generate most of the conditions you will actually meet at the facial bed.

How a comedo forms is worth understanding rather than memorising, because it explains every service rule that follows. Three things happen inside the follicle at once: the lining sheds cells faster than they can clear (follicular hyperkeratinisation), sebum output rises, and the resident bacterium Cutibacterium acnes — the organism formerly called Propionibacterium acnes — multiplies in the plugged, oxygen-poor follicle. Inflammation follows. The plug itself is a comedo: open at the surface it is a blackhead, and the dark colour is oxidised sebum and melanin, not trapped dirt. That is a standard exam trap, and it is also why scrubbing harder makes a client's skin worse rather than cleaner. Closed below the surface, the same plug is a whitehead.

If inflammation escalates, the comedo becomes a papule, then a pustule, then in severe cases a nodule or cyst. Cosmetology courses commonly grade the result from Grade I — mainly comedones with a few papules — through Grade II, with many comedones plus papules and pustules, to Grade III, with widespread inflamed papules and pustules, and Grade IV, with nodules and cysts and a real risk of scarring. The service rule tracks the grade: gentle cleansing and superficial extraction of open comedones only at Grades I and II, and no extraction at all and a referral at Grades III and IV. Squeezing an inflamed lesion drives its contents deeper, and the two predictable consequences — post-inflammatory hyperpigmentation and scarring — are exactly what the client came in to avoid.

4. Pigmentation, Moles and Inflammatory Conditions

Pigment disorders divide into hyperpigmentation, where melanin is overproduced, and hypopigmentation, where it is absent or lost. Neither is treatable by a cosmetologist, and both are frequently made worse by heat, friction and aggressive exfoliation. Clients with deeper skin tones are at higher risk of post-inflammatory hyperpigmentation after any trauma to the skin, which is a practical reason to work gently and to record the Fitzpatrick assessment covered in section 13.3.

Moles deserve their own rule. A nevus is never waxed over, never cut, never abraded and never worked aggressively around. The one thing you are expected to do is notice change, and the ABCDE memory aid is the standard tool for describing it: Asymmetry, irregular Border, uneven or changing Colour, Diameter larger than about 6 mm, and Evolving — any change in size, shape, colour, elevation or sensation, or new bleeding, itching or crusting. Noticing an ABCDE feature does not mean telling the client what it is. It means saying that you have observed a change and that a physician should look at it, and recording that you said so.

Sun damage produces its own vocabulary that a busy stylist sees constantly: scattered lentigines on the hands and décolleté, telangiectasia — visible dilated capillaries — across the cheeks and nose, rough scaly patches, and general loss of elasticity. Every one of them is a describe-and-refer observation, not a treatment opportunity.

5. Contagion: the Four Groups and the Salon Response

You do not need to name an organism to act correctly, but knowing the four groups makes the pattern obvious. Bacterial conditions include impetigo, folliculitis, furuncles and carbuncles; viral conditions include herpes simplex, verrucae and molluscum contagiosum; fungal conditions include the tineas covered in section 6.7; and parasitic infestations include scabies and pediculosis. Chapters 3.1 and 3.2 cover how each group is transmitted.

When a client presents with something that could be contagious, the response is a fixed sequence rather than a judgement call:

1. Stop the service before any implement touches the area.
2. Discard single-use items — files, buffers, applicators, wooden spatulas — and never double-dip a wax applicator (section 13.4).
3. Clean and disinfect multi-use implements and the work surface using an EPA-registered, hospital-grade disinfectant at the contact time on the label, as required by 19 NYCRR §§ 160.17 and 160.18.
4. If blood or body fluid is involved, follow the § 160.19 procedure in section 3.6, including the blood-spill kit and the sharps container.
5. Refer and rebook. Record what you observed, what you did and what you advised.

6. Applying the Contraindication Rules

Three questions decide every case, and none of them requires a diagnosis:

1. Is it broken, weeping, crusted or bleeding? No service over it.
2. Could it be contagious? No service; refuse, decontaminate per sections 3.4 and 3.5, refer.
3. Is it inflamed, painful or spreading? No service over it; refer.

If none of the three applies, the service may proceed with modification — working around the area, using gentler products, avoiding heat and stimulation.

The client's recent history modifies the answer as much as what you can see. Ask about oral isotretinoin, topical retinoids, recent chemical peels or laser work, and strong acid exfoliants, all of which thin or sensitise the skin and turn a routine wax into a skin-lifting injury. Section 13.4 covers the hair-removal contraindications in detail; the principle is the same in the facial chair.

Recording what you see

Write descriptions, not diagnoses:

• Good: "Two raised inflamed lesions at the left jaw; avoided the area; advised client to see a doctor before next wax."
• Not acceptable: "Client has acne; recommended salicylic treatment course."

The first is an accurate professional record. The second is a diagnosis and a treatment recommendation, both barred by 19 NYCRR § 160.27(c).

Saying it well

A refusal that is handled badly loses the client; handled well, it earns trust. Speak quietly and privately, describe rather than label, explain the reason in terms of the client's own result, and always offer a next step: "I can see some irritation along the brow line today, so waxing there would lift the skin. I'd rather not risk it. Let's do the tint and rebook the wax for when it's settled — and if it hasn't calmed down in a week, it's worth having a doctor look at it." Then write it on the card. That record is your evidence that you observed, modified and referred rather than diagnosed.