<prompt> All trans retinoic acid is used topically for -Acne vulgarisLupus vulgarisAlopecia areataAndrogenic alopecia  <response>: 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. 