I'm a 50 yrs old white woman, with fair skin. I've been using Retin-A for a few months now, starting at 0.025 % and just now started at 0.05%. I wash my face and then wait a couple of hours before putting on the Retin-A. Does that wait negate the affects of Retin-A? Also, I would like to add microneedling to my regime every few months. Is that possible, and how should I proceed with that? All info is greatly appreciated!