My derm just put me on this last week. She said that it could cause some side affects (itchy skin, redness, peeling) and she warned that if I am going to be out in the sun that I don't need to use it. Do any of you use Retin-A? Just trying to figure out what to expect. The directions she gave me said to start off applying it just Monday and Thursday night - Monday night I did and didn't notice anything, but I'm not sure if it will get worse?? TIA!