<unk>  is a rare, familial, nonpuritic skin disorder characterized by papules that grow in a diameter of 4 to 6mm and develop a central area of umbilication to which keratinous material is lodged. The cause of<unk>  is unknown.
Reactive perforating collagenosis
Perforating calcific elastosis
Eruptive pseudoangiomatosis
Verrucous perforating collagenoma
Multifocal fibrosclerosis
Fibrin ring granuloma
Fibrinoid necrosis
Nodular vasculitis