Contact dermatitis from dibutylthiourea. Report of a case with fine structural observations of epicutaneous testing with dibutylthiourea.

A 35-year-old machinist developed hand eczema from contact allergy to dibutylthiourea, a compound found in a paint and glue remover. Light and electron microscopy of his positive patch test was consistent with allergic contact dermatitis, showing Langerhans cell-mononuclear cell contacts in the epidermis.