Familial anetoderma: a report of two families.

Anetoderma is a rare cutaneous disorder where a localized dermal defect of elastic fibers determines depressed areas and often herniated saclike skin. Primary anetoderma is an idiopathic phenomenon while secondary anetoderma is related to various conditions. The term primary anetoderma implies that the lesions occur in clinically normal skin although they may be associated with another dermatological or systemic disease or condition, without a well established relationship. The term secondary anetoderma implies that anetoderma occured on the same site as another skin lesion. Familial anetoderma is a very rare condition that can be associated with bony, neurological and ocular anomalies. Recently some families with familial anetoderma have been described, where the disease seems to be limited to the skin. The pathogenesis for familial anetoderma is still unclear. It has been reported in only 10 families and in the first 4 reported families, anetoderma was always associated with extra-cutaneous abnormalities, while in the remaining 6 families, all described in last three decades, anetoderma was limited to the skin. We report here another two families with anetoderma without any associated disease and we review the literature on familial anetoderma.