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Facts about the skin from DermNet New Zealand Trust. Topic index: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z



Dermatophytide reactions

A dermatophytide (ide or id) is an allergic rash caused by an inflammatory fungal infection (tinea) at a distant site.

The rash is usually itchy like dermatitis, with bumps or blisters scattered on face, trunk and/or limbs. Fungus cannot be cultured from an ide. The ide can be treated with topical steroid and will resolve once the original infection has been controlled.

Clinical features

Dermatophytide
Case1: Widespread rash
Dermatophytide
Primary zoophilic dermatophyte infection
Dermatophytide
Crusted itchy papules
Dermatophytide
Case 2: Athlete's foot
Dermatophytide
Clusters of papules on knees
Dermatophytide
Pompholyx-like reaction
Dermatophytide

Diagnosis

The diagnosis of a dermatophytide is made by the clinical presentation and confirmed by microscopy and culture of the primary skin infection.

Treatment

The primary fungal infection usually requires an oral antifungal medication for control, but in mild cases a topical antifungal agent applied to the source of infection (e.g. to the athlete's foot) may be adequate.

The dermatophytide reaction is a type of eczematous dermatitis, and should be treated with topical steroids and emollients. Occasionally systemic steroids are required for a few weeks.

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