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Shoe dermatitis from para‐tertiary butylphenol formaldehyde

A 38-year-old woman with itching and burning foot attended our outpatient clinic. These complaints were present for the last 3 months. She used many topical antimycotic therapies, with a misdiagnosis of tinea pedis. On dermatological examination, there was erythema on her feet, which were strictly exposed to the shoes she was wearing (Figs 1 and 2). The patient’s interdigital areas were normal. No other body area was affected. A KOH preparation was evaluated for tinea pedis, and it was negative. Patch testing was performed with the European Standard Series. The patient denied giving a small piece of her shoes for patch testing. She showed a 2þ reaction to para-tertiary butylphenol formaldehyde. Topical midpotent steroid preparation and systemic antihistamines as well as emollients were started. The patient was instructed to avoid preparations containing para-tertiary butylphenol formaldehyde, and cotton socks usage was advised as a barrier.