[AA amyloidosis with cutaneous manifestations. Report of one case].

Systemic amyloidosis is a rare disease that can affect any organ. Its clinical manifestations are varied and nonspecific. The skin involvement of this disease is common and can be easily recognized on physical examination.

[Acquired reactive perforating collagenosis: report of two cases].

Acquired reactive perforating collagenosis is a perforating dermatosis characterized by transepidermal elimination of collagen. It is frequently associated to diabetes mellitus and chronic renal insufficiency, but it is also related to other systemic diseases. The lesions tend to resolve once the underlying condition is treated.