All trans retinoic acid is used topically for -
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.
Acne vulgaris
Lupus vulgaris
Alopecia areata
Androgenic alopecia
Skin