Use Retin-A exactly as your doctor has prescribed it for you. Follow all directions on your prescription label. Do not use this medicine in larger or smaller amounts or for longer than recommended. Do not take by mouth. Retin-A is for use only on the skin.
Definition of wall for English Language Learners : a structure of brick, stone, etc., that surrounds an area or separates one area from another : the structure that forms the side of a room or building
Definition of fence. 1  1 archaic : a means of protection : defense. 2  2a : a barrier intended to prevent escape or intrusion or to mark a boundary; especially : such a barrier made of posts and wire or boardsb : an immaterial barrier or boundary line on the other side of the fence in the argument. 3  3 : fencing  1.