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Eruptive vellus hair cysts: an original case occurring in twins

The term eruptive vellus hair cysts (EVHC) was introduced by Esterly et al. in 1977. They are characterized by millimetric papules typically located on the pre-sternal region and extremities, appearing usually in childhood. Prevalence is unknown. There is no sex or ethnic predilection. Lesions resolve spontaneously in a quarter of cases. Diagnosis is confirmed histologically. The pathogenesis is poorly understood. Autosomal dominant familial forms have been identified, suggesting the presence of a genetic mutation. We report here an unusual form of facial EVHC in two twin sisters. In our observations, EVHC appears as a differential diagnosis of acne.