I have been using retin-a .1% micro for slightly over three months now, for moderate acne vulgaris. It has completely cleared my face up, but has left my face with a pink/red tone, very similar to that of a mild sunburn. It is only in the area where I have been applying retin-a. Is there any ways to revert back to my normal skin tone? Preferably without discontinuing retin-a usage?