<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 etiology of<unk>  is unknown.
Reactive perforating collagenosis
Multifocal fibrosclerosis
Granulomatous angiitis
Necrobiosis lipoidica
Nephrogenic fibrosing dermopathy
Bacillary angiomatosis
Acrokeratoelastoidosis of Costa
Lymphangitis carcinomatosa