Transepidermal elimination of traumatically altered collagen. Report of three cases and considerations on the relationship between 'collagénome perforant verruciforme' and reactive perforating collagenosis.

Three cases of transepidermal elimination of traumatically altered collagen, including a case of 'collagénome perforant verruciforme' (CPV), are reported. On the basis of our own observations and on the data of the literature, CPV and reactive perforating collagenosis are considered as related, but different entities.