Coexistence of morphea and psoriasis responding to acitretin treatment.

A large number of dermatoses associated with either morphea and psoriasis have been reported. However, to the best of our knowledge there is only one report in the literature about coexistence of morphea and psoriasis. Here we report a case of morphea and psoriasis that improved with acitretin treatment. The concomitant occurrence of these two dermatoses may be explained by immunological factors or trauma. We think that the improvement of the morphea lesions may be due to an immunomodulatory effect of the drug or a decrease in collagen production by dermal fibroblasts due to retinoic acid.