I understand that you apply it in the evening but I have heard a few people say that you need to wait 30 minutes after washing face before applying Retin-A to face.
Apart from the instructions on the package saying that it needs to be applied to dry skin I am at a lose as to why you would need to wait 30 minutes. I've read a few explanations at a few other forums but the explanations are very unscientific and sound a lot like goobledegook to this young scientist
Reason:
Freshly washed skin = open pores and therefore sensitive?
Reaction between water and Retin-A?
Tooth Fairey?