is it okay to add tretinoin gel .025 in places on your face that didn't have acne before you put it on there? Also my skin is much more oily now. Is this ok? Also I've been using it for about 4 weeks now. But I forgot to use it 2 or 3 different days during this period. Do you think this really screwed up my skin or would my skin be able to adjust back to it quickly?