Are the effects of topical skin treatments ever wear off?

I'm 20 years old but i abused my skin for about 3 years and just stopped a few months ago. It might sound like i'm exaggerating but it really did become an awful obsession. I used a ridiculous amount of products that i probably should not have used as much as i did (such as retin-a) and scrubbed my face raw for a long time...sigh. It's been about 3 months now since i've left my face alone and i see a slight improvement but i'm wondering if it will ever completely heal and go back to normal,to the way it was before i used all those products? Or have they made permanent changes to my skin? I'm mostly concerned about my abuse of retin-a since it's so strong...my eye area has especially suffered through my overuse of retin-a on the area for such a long time and now my eyes look really sunken in...