Seborrhea, psoriasis and the papulosquamous dermatoses.

Knowledge of the papulosquamous disorders is an important part of the diagnosis of skin diseases in general. Recognition of these commonly encountered cutaneous problems depends upon familiarity with the configuration and distribution of lesions on various parts of the body. Diagnostic tests (such as KOH to rule out tinea) should be performed, and when therapy does not seem to be successful, the diagnosis should be reconsidered with a biopsy and/or dermatologic consultation.