Characteristics of patch test patients in Yogyakarta, Indonesia, 2011-2020 Study Period

Introduction Patch tests are performed to identify allergens that cause contact dermatitis. There were varying results on the prevalence of contact dermatitis to specific allergens from different countries. Methods A retrospective study was conducted over a 10-year period from January 2011 to December 2020 on patch test patients performed at Dr. RSUP. Sardjito, Yogyakarta. Results During 2011-2020, 616 patients underwent 735 different patch test series. The percentage of female patients was higher than the male patients. The most common diagnoses were drug eruption, allergic contact dermatitis (ACD) due to cosmetics, nummular dermatitis, hand eczema, ACD due to hair dye, ACD due to footwear, ACD due to metals, pigmented contact dermatitis, and atopic dermatitis. The most common allergens were nickel sulphate, cobalt chloride, potassium dichromate, Peru balsam, neomycin sulphate, fragrance mix I, paraben mix, colophony, carba mix, and p-phenylenediamine (PPD). Conclusion Sensitization to metals, namely nickel sulphate, cobalt chloride, and potassium dichromate, became the largest proportion of allergen results in this study. © 2023 Pakistan Association of Dermatologists. All rights reserved.