What histologic finding distinguishes onychomycosis and psoriasis?
D001706:Biopsy; D003937:Diagnosis, Differential; D006801:Humans; D009260:Nail Diseases / Q000175:diagnosis / Q000473:pathology*; D009262:Nails / Q000473:pathology; D014009:Onychomycosis / Q000175:diagnosis / Q000473:pathology*; D011565:Psoriasis / Q000175:diagnosis / Q000473:pathology*