Scalp rash

Overview
Though diagnosis of scalp dermatitis / infection is easy, treatment can be more difficult. Topical therapy alone, or topical therapy in coordination with systemic therapy for long periods may be essential to maintain complete control of these problems.

Differential diagnosis of causes of a rash on the scalp
In alphabetical order.


 * Contact dermatitis
 * Dissecting cellulitis of the scalp
 * Discoid lupus
 * Kerion
 * Psoriasis
 * Scalp folliculitis
 * Seborrheic dermatitis
 * Tinea capitis

Seborrheic dermatitis

 * diffuse
 * white
 * non-adherent

Bacterial folliculitis

 * use intact scalp pustule to determine diagnosis

Laboratory Findings

 * KOH prep can be done in the office to check for spores within the hair shaft
 * Fungal cultures can be taken at the site of a kerion or scalp scale to rule out tinea capitis
 * ensure root is intact


 * A shave biopsy should not be done liberally; can aid in determining seborrheic dermatitis

Suborrheic dermatitis

 * Ketoconazole
 * Tar
 * Salicylic acid shampoos
 * Zinc pyrithione

Tinea capitis

 * Antifungal therapy

Kerion

 * Antifungal therapy
 * Steroids

Scalp folliculitis

 * 1st generation cephalosporin or tetracycline derivative for 2-4 weeks

Discoid lupus

 * Intralesional injection of steroids

Dissecting cellulitis

 * Intralesional steroids
 * systemic retnoids
 * antibiotic therapy