3.3 Scalp and Hair Disorders & Diseases

Scalp and Hair Disorders & Diseases

Core Knowledge: Barbers are on the frontline of scalp and skin evaluation. While barbers do not medically diagnose or treat diseases, they are legally and professionally mandated by the Indiana State Board of Cosmetology and Barber Examiners to recognize abnormal scalp conditions, differentiate contagious from non-contagious disorders, refuse service when contagious pathogens are present, and maintain strict infection control protocols.

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Classifications of Hair Loss (Alopecia)

Alopecia is the technical medical term for abnormal hair loss, thinning, or baldness that exceeds the normal physiological daily shedding rate of 50 to 100 hairs.

                                  TYPES OF ALOPECIA
                                          │
         ┌───────────────────┬────────────┴───────┬───────────────────┐
         ▼                   ▼                    ▼                   ▼
   ANDROGENETIC           AREATA               TRACTION            TELOGEN
     ALOPECIA            ALOPECIA              ALOPECIA           EFFLUVIUM
  • Genetic + DHT     • Autoimmune attack   • Mechanical tension• Shock / Stress
  • Terminal to vellus• Round bald patches  • Tight braiding    • Anagen to telogen
  • Norwood scale     • Exclamation hairs   • Reversible early  • Diffuse thinning

1. Androgenetic Alopecia (Male Pattern Baldness)

Androgenetic Alopecia is the most common form of hair loss, characterized by progressive thinning and miniaturization of hair follicles across the hairline, crown, and vertex.

• Etiology: A combination of genetics, age, and hormonal activity.
• Biochemical Mechanism: The enzyme 5-alpha reductase converts circulating testosterone into Dihydrotestosterone (DHT). In genetically predisposed follicles, DHT binds to follicle androgen receptors, shortening the anagen growth phase and shrinking the follicle diameter. Terminal hairs (thick, pigmented strands) progressively regress into fine, non-pigmented vellus hair.
• Clinical Staging: Classified in men using the Norwood-Hamilton Scale (Stages I through VII).
• Treatments: Minoxidil (topical vasodilator) and Finasteride (oral 5-alpha reductase inhibitor).

2. Alopecia Areata

Alopecia Areata is an autoimmune disease in which the body's immune system mistakenly attacks hair follicles during the anagen phase.

• Clinical Presentation: Sudden appearance of round or oval, smooth, bald patches on the scalp or beard.
• Microscopic Hallmark: Exclamation point hairs—short broken hairs surrounding the margin of the bald patch that are narrow at the scalp base and wider and pigmented at the distal tip.
• Progressive Forms:
  • Alopecia Totalis: Complete loss of all scalp hair.
  • Alopecia Universalis: Complete loss of all hair over the entire body, including eyebrows, eyelashes, and body hair.

3. Traction Alopecia

Traction Alopecia is hair loss resulting from continuous, excessive physical tension or pulling on the hair follicles over extended periods.

• Causes: Extremely tight cornrows, tight braids, tight ponytails, heavy dreadlocks, or hair extensions.
• Prognosis: Reversible if identified early and tension is eliminated; becomes irreversible scarring alopecia (cicatricial alopecia) if chronic pulling destroys the dermal papilla.

4. Telogen Effluvium

Telogen Effluvium is the sudden, diffuse shedding of hair across the entire scalp caused by a systemic physiological shock or severe stressor.

• Triggers: High fever, major surgery, general anesthesia, severe illness, rapid extreme weight loss, childbirth, or severe psychological trauma.
• Mechanism: The shock prematurely forces a large percentage of actively growing anagen follicles into the telogen (resting) phase simultaneously, resulting in heavy shedding 2 to 4 months after the event.
• Prognosis: Typically self-limiting; full recovery usually occurs within 6 to 9 months once the underlying stressor is resolved.

5. Other Forms of Alopecia

• Alopecia Senilis: Normal, progressive age-related hair thinning caused by generalized follicular atrophy in elderly individuals.
• Postpartum Alopecia: Temporary hair shedding experienced by women 2 to 4 months following childbirth due to sudden drops in pregnancy hormone levels.

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Contagious Fungal Infections (Tinea)

Tinea is the medical term for ringworm, an infectious disease caused by dermatophyte fungi (Trichophyton and Microsporum species) that feed on keratin. Fungal infections are highly contagious and easily transmitted via contaminated shears, clippers, razors, brushes, combs, and capes.

                                FUNGAL INFECTIONS (TINEA)
                                           │
                   ┌───────────────────────┼───────────────────────┐
                   ▼                       ▼                       ▼
             TINEA CAPITIS           TINEA BARBAE            TINEA FAVOSA
            (Scalp Ringworm)       (Barber's Itch)         (Honeycomb Favus)
            • Red papules/spots    • Fungal beard infection• Sulfur-yellow crusts
            • Brittle stubble      • Pustules & boggy skin   called SCUTULA
            • Circular scales      • Spread by razor/mugs  • Musty odor / scars

1. Tinea Capitis (Ringworm of the Scalp):
   • Characterized by red papules or scaly spots at the opening of hair follicles.
   • Hair becomes brittle, lusterless, and breaks off flush with or slightly above the scalp, leaving circular patches of short stubble ("black-dot ringworm").
   • Severe cases can develop a kerion—a swollen, boggy, inflamed mass oozing pus.
2. Tinea Barbae (Barber's Itch):
   • A superficial-to-deep fungal dermatophyte infection affecting the bearded areas of the face and neck in adult men.
   • Produces red, inflammatory pustules, crusts, and swollen boggy lesions surrounding beard hairs. Historically transmitted via unsterilized straight razors and shared shaving mugs.
3. Tinea Favosa (Favus / Honeycomb Ringworm):
   • Characterized by dry, sulfur-yellow, cup-like crusts on the scalp known as scutula.
   • Scutula emit a distinct, musty, mousy odor.
   • Destroys hair follicles, resulting in permanent pink/white atrophic scars and permanent patchy baldness.

Mandatory Barber Action: For all suspected Tinea infections, IMMEDIATELY REFUSE SERVICE. Do not shave or cut hair in affected areas. Disinfect all contaminated tools using an EPA-registered hospital-grade disinfectant and refer the client to a physician.

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Bacterial Infections of the Hair Follicle and Skin

Bacterial infections in barbering are primarily caused by Staphylococcus aureus (staph bacteria):

                                BACTERIAL INFECTIONS
                                         │
         ┌───────────────────────────────┼───────────────────────────────┐
         ▼                               ▼                               ▼
   FOLLICULITIS BARBAE           SYCOSIS VULGARIS               FURUNCLE / CARBUNCLE
   • Staph infection of follicle • Deep chronic staph infection  • Furuncle: single boil
   • Superficial pustules        • Coalescing crusts/scarring   • Carbuncle: cluster of boils
   • Pierced by hair shaft       • Entire follicle depth          draining pus

1. Folliculitis Barbae:
   • A superficial bacterial Staphylococcal infection of hair follicles in the beard and mustache regions.
   • Appears as small, discrete, red papules and yellow-topped pustules pierced by a central hair shaft.
2. Sycosis Vulgaris (Sycosis Barbae):
   • A chronic, deep, recurrent bacterial Staphylococcal infection involving the entire depth of the hair follicle in the beard area.
   • Features large, coalescing pustules, erythema, severe swelling, oozing, crusting, and potential scarring.
3. Furuncle (Boil):
   • An acute, localized bacterial infection of a single hair follicle that produces intense, throbbing pain, localized swelling, and a central core of purulent exudate (pus).
4. Carbuncle:
   • An extensive, deep-seated bacterial infection formed by a cluster of interconnected furuncles in the subcutaneous tissue. Features multiple drainage openings discharging pus, accompanied by severe pain and systemic fever.

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Non-Infectious Beard Disorders: Pseudofolliculitis Barbae (PFB)

Pseudofolliculitis Barbae (PFB), commonly known as "Razor Bumps," is a non-infectious, foreign-body inflammatory reaction of the skin caused by curved, tightly coiled facial hair.

                    MECHANICS OF PSEUDOFOLLICULITIS BARBAE (PFB)
  ┌─────────────────────────┐                ┌─────────────────────────┐
  │   CLOSE SHAVE CUTS      │ ─────────────> │  CURVED HAIR GROWS OUT  │
  │   HAIR BELOW SKIN       │                │  AND PIERCES EPIDERMIS  │
  └─────────────────────────┘                └─────────────────────────┘
                                                          │
                                                          ▼
                                             ┌─────────────────────────┐
                                             │ FOREIGN-BODY INFLAMMATION│
                                             │ (Papules, bumps, scars) │
                                             └─────────────────────────┘

Pathophysiology & Etiology

• When tightly coiled facial hair is shaved extremely close (especially against the grain or with multi-blade cartridge razors), the sharpened hair tip retracts below or level with the skin surface.
• As the curved hair grows, its sharp beveled tip curves around and penetrates the adjacent skin (extrafollicular penetration) or pierces through the follicle wall from within (intrafollicular penetration).
• The embedded keratin acts as a foreign body, triggering an intense immune inflammatory response characterized by painful red papules, sterile pustules, hyperpigmentation, and potential keloidal scarring.

Folliculitis Barbae vs. Pseudofolliculitis Barbae

Barber Management of PFB

• Modify Shaving Technique: Avoid close straight-razor or multi-blade shaving. Use adjustable electric trimmers or outliners (leaving 1/32 to 1/16 inch of stubble).
• Shave With the Grain: Always shave strictly in the direction of natural hair growth; never shave against the grain or stretch skin overly taut.
• Preparation: Apply warm, moist towels to soften the hair fiber before grooming.
• Post-Care: Recommend gentle chemical exfoliants containing salicylic acid or glycolic acid to keep follicle openings clear.

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Scalp Disorders: Dandruff (Pityriasis) and Scalp Dermatoses

Dandruff (medical term Pityriasis) is the excessive shedding of dead epidermal scalp cells. It is linked to an overgrowth of Malassezia, a naturally occurring lipophilic yeast on the scalp.

                                  DANDRUFF (PITYRIASIS)
                                            │
                   ┌────────────────────────┴────────────────────────┐
                   ▼                                                 ▼
      PITYRIASIS CAPITIS SIMPLEX                         PITYRIASIS STEATOIDES
            (Dry Dandruff)                                  (Greasy Dandruff)
      • Small, dry, white/gray scales                   • Waxy, greasy, yellow crusts
      • Sheds freely onto shoulders                     • Adheres tightly to scalp
      • Mild itching                                    • Inflammation & sebum buildup
      • Treated with anti-dandruff shampoo              • Medical referral if weeping

1. Pityriasis Capitis Simplex (Classic Dry Dandruff):
   • Characterized by small, white-to-grayish dry flakes that detach easily and fall onto clothing.
   • Accompanied by mild itching. Managed with professional anti-dandruff shampoos containing zinc pyrithione, selenium sulfide, ketoconazole, or coal tar.
2. Pityriasis Steatoides (Greasy / Waxy Dandruff):
   • A more severe form characterized by thick, greasy, yellowish scales that stick to the scalp in clumps and crusts, accompanied by sebum buildup and inflammation.
   • Often associated with Seborrheic Dermatitis (chronic inflammatory condition of sebaceous areas). If open sores, weeping, or severe inflammation are present, refuse service and refer to a physician.
3. Psoriasis:
   • A non-contagious, chronic autoimmune disease characterized by rapid epidermal skin cell turnover (3 to 4 days instead of normal 28 days).
   • Appears as thick, red, raised patches covered with coarse, silvery-white scales on the scalp, elbows, knees, and lower back.
   • Barber Protocol: Service may proceed if the skin is intact and unbroken; avoid harsh chemicals, aggressive brushing, or scraping the plaques.

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Parasitic Infestations of the Head and Face

Parasites are plant or animal organisms that live in or on another living organism and draw nourishment from the host. They are strictly contagious:

1. Pediculosis Capitis (Head Lice):
   • Infestation of the scalp by the insect parasite Pediculus humanus capitis.
   • Lice feed on human blood, causing intense scalp itching (pruritus) and excoriation.
   • Diagnostic Sign: Small, oval, grayish-white nits (eggs) firmly glued to hair shafts near the scalp surface. Unlike dandruff flakes, nits cannot be shaken or brushed off.
2. Scabies ("The Itch"):
   • A highly contagious skin disorder caused by the microscopic itch mite (Sarcoptes scabiei).
   • Female mites burrow under the skin to lay eggs, producing intense nighttime itching, red papules, and blister-like burrow tracks.