There are no racial variations in incidence. The acquired form occurs in adults. Small asymptomatic papules develop following minor trauma. The lesions start as pin-sized lesions and develop into larger papules over a few weeks. They heal with residual minor scarring.
Intense pruritus is a feature of acquired perforating dermatosis.
In this condition a history of diabetes or renal failure is often elicited. A positive family history may be elicited in the childhood form. They have a keratinous plug. Lesions may present in a linear pattern exhibiting the Koebner phenomenon. Residual scarring may be seen from previously healed lesions.