Subtle clues to diagnosis by histochemistry. Mast cell disease.
D006651:Histocytochemistry; D006801:Humans; D008407:Mast Cells / Q000473:pathology; D012867:Skin / Q000473:pathology; D013194:Staining and Labeling; D014582:Urticaria Pigmentosa / Q000175:diagnosis* / Q000473:pathology