P-phenylenediamine dermatitis

Paraphenylenediamine dermatitis refers to eczema-like changes in dermatitis caused by exposure to paraphenylenediamine. Skin lesions can occur on the back of hands, wrists, forearms, eyelids, and nose, showing erythema, pimples, papules, scattered or dense skin lesions, and exudation. Elderly patients may have lichen-like changes. Contact dermatitis caused by p-phenylenediamine-based hair dyes is also called hair dermatitis and usually starts on the scalp.