title: Nickel sensitivity as a complication of squaric acid dibutylester treatment of alopecia areata.
mesh_terms: D000328:Adult; D000485:Allergens; D000506:Alopecia Areata / Q000188:drug therapy*; D003503:Cyclobutanes / Q000009:adverse effects* / Q000627:therapeutic use; D003877:Dermatitis, Contact / Q000209:etiology*; D005260:Female; D006801:Humans; D009532:Nickel / Q000633:toxicity*
chemical_list: D000485:Allergens; D003503:Cyclobutanes; C020637:squaric acid dibutyl ester; D009532:Nickel