8.3 Hair & Scalp Disorders and Diseases

8.3 Hair & Scalp Disorders and Diseases

Quick Answer: Learn to recognize common scalp and hair conditions, then decide serve with modification, refuse, or refer. Pityriasis (dandruff), seborrheic dermatitis, and psoriasis are important scale/inflammation topics. Tinea capitis, pediculosis (lice), furuncles, and carbuncles mean do not proceed when infection/infestation is present. Damaged-fiber terms — trichoptilosis, trichorrhexis nodosa, canities, hypertrichosis — appear on theory exams as identification items. Contagious disease control aligns with Ohio’s Infection Control (24%) and A&P (27%) weights.

Structure (8.1) and analysis (8.2) assume a relatively healthy scalp. Real clients bring flakes, itch, patches, pests, and broken ends. The licensed cosmetologist’s job is not medical diagnosis by Latin name for a chart — but Board theory still expects correct recognition vocabulary and the safety decision: when is service contraindicated?

Professional Decision Framework

When in doubt, protect the public. One contagious scalp service can expose an entire appointment book. Ohio’s strong infection-control emphasis on the Theory TIP rewards that mindset.

Dandruff (Pityriasis)

Dandruff is commonly discussed under pityriasis terminology in cosmetology texts — excessive production of visible scales on the scalp.

Two classic teaching categories:

Contributing factors discussed in textbooks include scalp microflora (e.g., yeast associations in modern understanding), oiliness, product buildup, infrequent cleansing, and individual sensitivity. Cosmetologists recommend medicated or clarifying shampoos as appropriate, improve cleansing habits, and avoid aggressive scratching that breaks skin.

Do not claim to permanently “cure” chronic medical seborrheic conditions with retail shampoo alone. Severe, inflamed, or atypical scale patterns need medical referral.

Seborrheic Dermatitis

Seborrheic dermatitis is a more inflammatory condition often related to oily areas (scalp, face folds, chest). On the scalp it can show redness, itching, and greasy yellowish scales. It is frequently discussed alongside severe dandruff presentations.

Service notes:

• Avoid irritating chemicals and heat on actively inflamed tissue
• Do not pick or aggressively scrape scales
• Refer persistent or severe cases to a physician/dermatologist
• Maintain implement disinfection standards so secondary infection risk stays low

Psoriasis on the Scalp

Psoriasis is a chronic skin condition that can affect the scalp with thick, silvery-scale plaques on reddened skin. It is not treated as a routine “dandruff shampoo upsell.”

Service notes:

• Cosmetologists do not diagnose psoriasis; physicians do
• Open, cracked, or bleeding plaques are contraindications for many chemical and abrasive services
• Gentle handling and physician-guided care plans take priority over elective aggressive treatments
• Never shamelessly scrape plaques “to clean the scalp”

Exam contrast: dandruff scales vs. thicker silvery psoriasis plaques — recognition, not prescription.

Contagious Conditions: Refuse Service

Tinea Capitis (Scalp Ringworm)

Tinea capitis is a fungal infection of the scalp and hair. Signs can include round scaly patches, brittle hair that breaks, black-dot appearance where hairs break at the follicle, itching, and sometimes kerion (inflammatory mass). It is contagious, especially among children, via contact and shared items.

Action: Refuse service. Do not proceed with cuts, colors, or styles on a suspected tinea scalp. Advise medical care. Disinfect thoroughly if exposure occurred; follow salon blood/body-fluid and contamination protocols as applicable. Fungal scalp disease is a classic stop-work example on theory exams.

Pediculosis Capitis (Head Lice)

Pediculosis capitis is infestation with head lice — parasitic insects that feed on the scalp. Signs include intense itching, visible lice, and nits (eggs) cemented to the hair shaft near the scalp.

Action: Refuse service immediately. Do not “try a quick dry” or style through infestation. Prevent spread to other clients and staff. Client needs appropriate pediculicide treatment guidance from pharmacy/medical sources — not a chemical texture service.

Shared brushes, caps, and towels are infection-control failures when lice are in play. This topic bridges hair disorders and the infection-control domain you already studied.

Furuncles and Carbuncles

A furuncle (boil) is an acute bacterial infection of a hair follicle, producing a painful, pus-filled nodule. A carbuncle is a cluster of boils with deeper, more extensive infection.

Action: Refuse services that involve the infected area. These are medical infections, not “acne on the scalp to squeeze.” Risk includes spreading bacteria via implements and hands. Refer to a physician; resume services only on healthy tissue after resolution and within professional judgment.

Other Scalp Issues (Brief Recognition)

You need perfect dermatology boards? No. You need contagious vs. non-contagious judgment and correct names for high-frequency items.

Damaged and Altered Hair Conditions

These are primarily hair-shaft conditions rather than contagious scalp disease:

Trichoptilosis (Split Ends)

Trichoptilosis is the technical term for split ends — longitudinal splitting of the hair shaft, usually at the distal ends from weathering, chemicals, heat, and mechanical stress.

Service response: Haircut to remove splits; reduce heat and chemical abuse; conditioning and bond-care as supportive (not magical regrowth of a fused end). Split ends do not “heal” back into virgin cuticle; they must be cut off.

Trichorrhexis Nodosa

Trichorrhexis nodosa presents as swellings or nodules along the shaft where the cuticle is damaged and the fiber frays, often leading to breakage at weak points. Causes include mechanical trauma, chemical over-processing, and sometimes congenital factors.

Service response: Gentle handling, blunt removal of damaged lengths when appropriate, avoid further chemical/thermal assault until fiber improves with growth and care. Recognition name is exam gold.

Canities

Canities is grayness or whiteness of hair from loss of natural melanin.

Service response: Color services (coverage, blending, fashion gray care), not medical “reversal” guarantees. Gray hair may have different texture/porosity — analyze before formulating.

Hypertrichosis

Hypertrichosis is excessive hair growth on areas where hair is normally minimal (terminal hair in usually vellus zones, or abnormally dense growth). It differs conceptually from hirsutism (male-pattern terminal hair in women due to androgens) — some textbooks emphasize hypertrichosis as the broader “superfluous hair” term for cosmetology.

Service response: Within scope, hair removal methods (tweezing, waxing, etc., covered in later skin chapters) where legal and appropriate; never mock clients. Medical causes of sudden excess growth merit referral.

Fragilitas Crinium and Related Breakage Language

Some outlines use fragilitas crinium for brittle hair that cracks and breaks. Treat it as the umbrella idea of brittle, easily broken hair from poor elasticity/protein loss — reinforce elasticity analysis from 8.2 and reduce chemical load.

Linking Disorders Back to Infection Control and Ethics

Every refuse-service decision protects:

1. The affected client — from worsened injury and delayed medical care
2. Other clients — from lice, fungi, and bacteria
3. You and coworkers — from occupational exposure
4. Your Ohio license — from reckless disregard of sanitation standards under Board expectations and OAC 4713 culture

Disinfect stations and tools after any suspected exposure per your infection-control training. Do not rely on “it looked almost fine.”

Study Tactics for Disorder Vocabulary

• Two-column cards: Name → one visual cue + serve/refuse
• Group pityriasis / seborrheic / psoriasis as scale conditions with escalating medical seriousness
• Group tinea / pediculosis / furuncle / carbuncle as hard refuse
• Group trichoptilosis / trichorrhexis nodosa / canities / hypertrichosis as shaft or growth terms often tested as pure definitions
• Practice scenario stems: “Client has nits cemented to the hair” → pediculosis → refuse

Master recognition and limits now. Later hair-service chapters assume you will not chemically process a contagious scalp or promise to grow back medically lost hair with a bottle of oil.