title: Cheilitis and cobalt allergy related to ingestion of vitamin B12.
mesh_terms: D002613:Cheilitis / Q000209:etiology*; D003035:Cobalt / Q000009:adverse effects*; D003877:Dermatitis, Contact / Q000209:etiology*; D005260:Female; D006801:Humans; D008875:Middle Aged; D014805:Vitamin B 12 / Q000009:adverse effects*
chemical_list: D003035:Cobalt; D014805:Vitamin B 12