6.1 Hair Loss Classifications, Scalp Disorders & Service Contraindications

6.1 Hair Loss Classifications, Scalp Disorders & Service Contraindications

4. Clinical Classifications of Hair Loss & Alopecia

Abnormal hair loss is clinically termed alopecia. Cosmetologists must distinguish between non-contagious aesthetic alopecias and medical pathologies:

1. Androgenic Alopecia (Androgenetic Alopecia)

Androgenic alopecia is a progressive miniaturization of terminal scalp hair follicles into fine, unpigmented vellus hair. It results from a combination of genetic heredity, chronological aging, and sensitivity to dihydrotestosterone (DHT), an active androgen metabolite. In men, it presents as male pattern baldness characterized by a receding frontotemporal hairline and crown thinning. In women, it presents as diffuse thinning across the entire crown while maintaining the anterior hairline.

2. Alopecia Areata

Alopecia areata is an autoimmune disorder in which the client's own immune system mistakenly attacks hair follicles at the base of the root. It begins with sudden, rapid hair loss in small, smooth, circular or oval bare patches on the scalp without visible inflammation. It can resolve spontaneously or progress into severe systemic variants:

• Alopecia Totalis: Complete, total loss of all hair across the entire scalp.
• Alopecia Universalis: Complete loss of all hair across the entire human body, including eyebrows, eyelashes, axillary, and pubic hair.

3. Postpartum Alopecia

Postpartum alopecia is temporary hair loss experienced by women following childbirth. During pregnancy, elevated maternal hormone levels (estrogen) disrupt normal shedding, prolonging the anagen phase and preventing normal daily hair loss. Following delivery, hormone levels rapidly plummet, causing sudden, synchronized transition of vast numbers of follicles into the telogen resting phase. Sudden diffuse shedding typically begins 2 to 4 months postpartum and resolves naturally within 3 to 12 months as normal cycling restores.

4. Telogen Effluvium

Telogen effluvium is the premature, generalized shifting of growing anagen hairs into the resting telogen phase, resulting in diffuse shedding across the entire scalp. Common physiological triggers include high sustained fevers, severe acute illness, major surgical trauma, crash starvation diets, sudden hormonal shock, or extreme psychological distress. Shedding typically manifests 2 to 3 months following the triggering event.

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5. Scalp Disorders, Dandruff & Infectious Contraindications

Cosmetologists regularly encounter scalp conditions ranging from manageable cosmetic flaking to severe, highly contagious infections:

                                 ┌───────────────────────────┐
                                 │      SCALP CONDITIONS     │
                                 └─────────────┬─────────────┘
                 ┌─────────────────────────────┴─────────────────────────────┐
                 ▼                                                           ▼
     ┌───────────────────────┐                                   ┌───────────────────────┐
     │  NON-CONTAGIOUS FLAKES│                                   │ CONTAGIOUS PATHOLOGIES│
     │ • Pityriasis Simplex  │                                   │ • Tinea Capitis       │
     │ • Pityriasis Steatoid │                                   │ • Pediculosis Capitis │
     │   (Malassezia yeast)  │                                   │ • Scabies (Itch Mite) │
     │ (Manageable in salon) │                                   │ • Furuncles & Boils   │
     └───────────────────────┘                                   │ (REFUSE & REFER MD!)  │
                                                                 └───────────────────────┘

1. Pityriasis (Dandruff)

Pityriasis is characterized by excessive shedding of dead epidermal cells from the scalp. Modern medical research confirms that dandruff is caused by the overgrowth of a microscopic, lipophilic fungus/yeast naturally present on human skin called Malassezia (formerly Pityrosporum ovale). When sebum production surges or immunity shifts, Malassezia multiplies excessively, accelerating cellular turnover and flaking:

• Pityriasis Capitis Simplex (Classic Dry Dandruff): Marked by persistent scalp irritation, mild itching, and small, thin, white/translucent scales that detach easily and scatter freely onto shoulders. Can be managed in the salon with anti-dandruff shampoos containing zinc pyrithione, selenium sulfide, or ketoconazole.
• Pityriasis Steatoides (Greasy/Waxy Dandruff): A more severe form characterized by an accumulation of greasy, yellowish, waxy scales and crusts mixed with sebum that stick to the scalp in dense patches. Often accompanied by localized erythema (redness) and inflammation. If open weeping sores or severe dermatitis are present, salon chemical services are contraindicated.

2. Tinea Capitis (Ringworm of the Scalp)

Tinea capitis is a contagious fungal infection caused by dermatophytes that invade the hair follicle and shaft. Symptoms include circular red scaling papules at follicle mouths, intense itching, crusting, and brittle hair shafts that break off flush with the scalp surface, producing a characteristic "black dot" appearance. Tinea capitis is highly contagious and represents an absolute contraindication to all salon services.

3. Pediculosis Capitis (Head Lice)

Pediculosis capitis is a parasitic insect infestation of the hair and scalp. Head lice are wingless parasites that feed on host blood, causing severe itching and secondary scratching excoriations. Female lice cement oval, pearly-white eggs (nits) firmly to individual hair shafts within one-quarter inch of the scalp. Unlike dandruff flakes, nits are glued with chitinous cement and cannot be brushed, blown, or flicked off the hair. Head lice are exceptionally contagious; salon services must be immediately refused.

4. Scabies (Itch Mite Infestation)

Scabies is a severely contagious skin disease caused by the microscopic itch mite (Sarcoptes scabiei). The female mite burrows beneath the epidermal stratum corneum to lay eggs and deposit feces, triggering violent nocturnal itching. It manifests as red, blister-like vesicles and characteristic thin, zigzag burrow lines across the skin, neck, and hairline. Cosmetologists must never service a client presenting active scabies.

5. Staphylococcal Bacterial Infections

Bacterial infections of the scalp are caused by pus-forming staphylococci microorganisms:

• Furuncle (Boil): An acute, localized bacterial infection of a hair follicle that produces intense, throbbing pain, localized swelling, erythema, and a central core of pus.
• Carbuncle: A severe, deep-seated bacterial infection caused by a cluster of interconnected furuncles draining through multiple follicular openings.
• Folliculitis: A superficial inflammation and pustular infection of one or more hair follicles centered around the hair shaft.

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6. Wisconsin Legal Standard & Exam Traps

Wisconsin Statutory Requirement: Wis. Admin. Code Cos 2.02 Under Wisconsin administrative code Cos 2.02, cosmetologists are strictly prohibited from diagnosing or attempting to treat any medical disease, infection, or pathology of the skin, scalp, or nails. When a licensee observes symptoms of contagious fungal, parasitic, or bacterial conditions (such as tinea capitis, pediculosis capitis, scabies, or furuncles), the practitioner must:

1. Politely and privately refuse service. Never embarrass the client on the salon floor.
2. State salon policy neutrally. Explain that state sanitation laws prohibit working on open lesions or active communicable conditions.
3. Provide a medical referral. Advise the client to consult a licensed physician or dermatologist for diagnosis and medical treatment.
4. Decontaminate the station. Disinfect all combs, capes, chairs, and implements contacted during the consultation using an EPA-registered hospital-grade disinfectant.