Air-borne contact dermatitis can be diagnosed by-: (A) Skin biopsy, (B) Patch test, (C) Prick test, (D) Estimation of serum IgE levels
Answer is B. air borne contact dermatitis is diagnosed by patch testing with the specific allergen. eg: pahenium is the common allergen tested using patch test. IADVL TEXTBOOK OF DERMATOLOGY, INDIAN PATCH TEST SERIES PAGE 581.