A rare case of familial reactive perforating collagenosis.

Reactive perforating collagenosis (RPC) is a rare disorder of transepidermal elimination in which genetically altered collagen is extruded out through the epidermis. This disease usually starts as asymptomatic or pruritic umbilicated papules on extensor aspects of extremities and face, and the lesions become more conspicuous with age. It has two forms: Acquired and inherited form, of which inherited form is extremely rare. Here, we document a case of inherited form of RPC in a 13-year-old boy having multiple asymptomatic hyperpigmented umbilicated papules with a central keratotic plug distributed chiefly over face and extensor aspect of upper and lower extremities since his infancy, with history of similar lesions in his 18-year-old elder brother. [ABSTRACT FROM AUTHOR]