Subungual trichogranuloma in a hairdresser.

Hairdressers may be subject to occupational skin diseases other than contact dermatitis. Interdigital trichogranuloma is a common disorder among those who cut men's hair but is much less common among those who cut women's hair. Interdigital trichogranulomas or interdigital sinuses are the result of penetration of the skin by short, sharp hair clippings. Subungual hair penetration appears to be much less common. This article reports the first case of subungual trichogranuloma in a hairdresser with psoriatic onycholysis. Onycholysis may be both a risk factor for and a consequence of cut hairs becoming imbedded subungually.