Author: Hon A/Prof Amanda Oakley, Dermatologist, Hamilton, New Zealand, 2003.
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.
Scattered small spots centred on hair follicles mainly affect the trunk usually follows a kerion (inflammatorytinea corporis or tinea capitis) from a zoophilic (animal) fungus.
Crops of fluid-filled blisters on the palms and backs of the hands resembling pompholyx may arise as a result of a severe tinea pedis or other dermatophyteinfection.