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Psoriasis and nummular dermatitis share several attributes histopathologic, namely, parakeratosis that often is accompanied by serum, psoriasiform acanthosis, spongiosis, edema of the papillary dermis, and an infiltrate of lymphocytes mostly around dilated venules of the superficial plexus. The changes histopathologic enumerated here apply only to fully developed, active lesions of psoriasis and nummular dermatitis, i.e., […]