title: Chronic urticaria caused by folic acid.
authors: Rommel
authors: R
authors: Valdivieso
authors: Francisco
authors: F
authors: Cevallos
authors: María Teresa
authors: MT
authors: Caballero
authors: Santiago
authors: S
authors: Quirce
mesh_terms: D000368:Aged; D000744:Anemia, Hemolytic, Autoimmune / Q000188:drug therapy; D001379:Azathioprine / Q000627:therapeutic use; D004342:Drug Hypersensitivity / Q000209:etiology* / Q000276:immunology; D005260:Female; D005492:Folic Acid / Q000009:adverse effects* / Q000276:immunology* / Q000627:therapeutic use; D006801:Humans; D002955:Leucovorin / Q000276:immunology; D016553:Purpura, Thrombocytopenic, Idiopathic / Q000188:drug therapy; D014581:Urticaria / Q000139:chemically induced* / Q000276:immunology
chemical_list: D005492:Folic Acid; D001379:Azathioprine; D002955:Leucovorin