Paraphenylenediamine is a potent skin sensitizer, which is uniformly present in hair dyes and henna tattoos. Paraphenylenediamine in hair dyes is well known to cause severe immediate reactions over the face; however, a long-term dermatologic reaction to paraphenylenediamine is hitherto unknown. In the present report, a case of prurigo nodularis–like lesions of the lower face resulting from application of hair dye to the moustache is described.
From the Departments of Dermatology & Sexually Transmitted Disease, *North DMC Medical College, Hindu Rao Hospital; and †Lady Hardinge Medical College & associated Hospitals, Delhi, India.
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The authors have no funding or conflicts of interest to declare.