D’Arcy Little, MD, CCFP, Lecturer, Department of Family and Community Medicine, University of Toronto, Toronto, ON.

The skin can be a window to certain internal diseases. Notable internal diseases with a prominent skin component include systemic lupus erythematosus, dermatomyositis, scleroderma, psoriasis, and sarcoidosis. This article will review some of the common skin manifestations of these diseases.

Key words: skin disease, internal disease, systemic lupus erythematosus, dermatomyositis, scleroderma, psoriasis, sarcoidosis.