Erythema elevatum diutinum.
D001415:Back; D003094:Collagen / Q000032:analysis; D003937:Diagnosis, Differential; D004890:Erythema / Q000175:diagnosis / Q000473:pathology*; D005542:Forearm; D006651:Histocytochemistry; D006801:Humans; D008214:Lymphocytes; D008297:Male; D008875:Middle Aged; D009504:Neutrophils; D012782:Shoulder; D012871:Skin Diseases / Q000175:diagnosis
D003094:Collagen