Objective To analyze the contact allergens of melanosis.Methods Fifty-six patients confirmed with melanosis between June 2010 and October 2013 received patch test and BICOM test,and the results were analyzed statistically and clinical data of the included patients were retrospectively analyzed.Results Of the 56 patients,50 patch tests and 40 BICOM tests were positive.The top three chemical allergic resources in patch test of these patients were nickel sulfate(33.9%),aluminum(21.4%),and potassium dichromate(...