Familial occurrence of axillary papular mucinosis.

Primary cutaneous mucinosis encompasses a wide range of different skin conditions with circumscribed, follicular or diffuse manifestation. For the first time, to our knowledge, we report on the occurrence of so-called "atypical" localized papular mucinosis in the axillary pits of a mother and her (identical) twin daughters presenting as asymptomatic soft minuscule papules. This unique observation allows us to define an autosomal dominant inheritance pattern with a high level of penetrance for this rare skin disease.