Id reaction from stasis dermatitis.

ID REACTION or AUTOSENSITIZATION ECZEMA

An id reaction (IR) is an eczematous reaction that occurs at a site distant to the location of a prior existing inflammatory rash. Stasis dermatitis and kerion celsi are common primary causes of this secondary eczematization.

Clinical

Itchy, eczematous papules are typical. The id reaction commonly affects the palms or upper extremities, but may occur in a widespread distribution. An id reaction may occur in patients with tinea capitis. Dermatophytid reactions are defined as secondary eruptions in response to dermatophytosis. They are most common in patients with kerion celsi. Eczematous scaly patches or plaques are typical. They occur unrelated to any therapy.

Here, a gram-negative toe web infection is causing an id reaction on the palms.

RegionalDerm

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