title: Systemic mastocytosis.
mesh_terms: D000328:Adult; D002648:Child; D006634:Histamine H1 Antagonists / Q000627:therapeutic use; D006801:Humans; D008407:Mast Cells; D014582:Urticaria Pigmentosa / Q000175:diagnosis* / Q000188:drug therapy
chemical_list: D006634:Histamine H1 Antagonists