Seborrheic dermatitis in a rhesus monkey (Macaca mulatta).

Seborrheic dermatitis was diagnosed in an adult, rhesus monkey presenting with erythematous, exfoliative and focally exudative skin lesions distributed over the perioral, perirhinal and brow regions of the face. Similar areas of involved skin also were observed on the extremities. Lesions appeared to be exacerbated during increased experimental utilization. Histopathologic changes in skin biopsy specimens of affected skin included acanthosis, parakeratosis, spongiotic edema, vascular ectasia, and mild lymphohistiocytic infiltrates.