Think it depends on the length of the treatment and the kind of skin you have. I don't recall how many weeks I went for. (Don't want to.) But my skin started to peel about half way through. (One side only). Creams were offered but didn't do much. I am very fair skinned. My son was horrified when he saw the pictures! I was very tempted to halt the treatment- but with Covid around I just wanted to get out of there!