Pharmacology Skin 69b667b1 All trans retinoic acid is used topically for - A Acne vulgaris B Lupus vulgaris C Alopecia areata D Androgenic alopecia High-Yield Explanation Ans. is 'a' i.e., Acne vulgaris * All-trans retinoic acid (Tretinoin) is used topically, while 13-cis retinoic acid (Isotretinoin) is given orally for acne.