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i used retin a 0.1 for two nights after not using it in close to a year ...i worked out in the sun all summer and my skin looked horrible ...anyway i peel from using it usually 2 days later like a small peel and the results are awesome ...skin is tighter plumper u can't see the scars as much ...i forgot just how great this stuff works for me anyway i am 37 with old sun damaged skin so it works well on me ...i am using it under my chin now as well and its tighting the whole face up nicely ...i also found a place you can get it cheap i think it was called allday chemist you can google it
I just wanted to post an update since older threads sometimes show up in searches. I stopped using retin a at the beginning of December and switched to Finacea and a prescription sulfur face wash. This combo has been a game changer for me. I've had maybe 1 or 2 tiny zits since starting this routine and the horrific red marks that refused to fade during the 4 months on retin a are almost gone. I'm also using a vitamin c serum in the morning which has certainly helped with the red marks, though finacea already started fading them before I incorporated the vitamin c. I now feel fine only spot concealing my remaining PIH and have actually skipped makeup altogether a couple times (which was unheard of for me previously). I use finacea at night, and the sulfur wash and vitamin c in the morning. I am able to skip any one of these products for a day or two and not break out.
As far as the scarring and skin texture goes, it looks marginally better since dropping retin a. However, I do have new boxcars and icepicks from the retin a breakout. I had no icepicks prior to retin a, only a few very shallow rolling or boxcars. I'm trying not to be too bitter about this, but I do wish I never touched retin a. If your skin is on the sensitive side, it might be worth trying finacea before retin a, even though retin a seems to be first line treatment. I have had no side effects from finacea except maybe some slight dryness, but it's nothing adequate moisturizing doesn't solve. In general, it makes my skin tone look clear and even and I love it.
Misinformation runs rampant on this forum. One only has to issue a statement that retin-a causes scars and people run with it without doing any research. I battled this for years with lasers, and finally decided to let people believe what they will. This is why I seldom post anymore. People flock to the negative.
Retina-A Micro (tretinoin) is a topical acne agent. It is used for treating acne vulgaris, smoothening of fine wrinkles, and fading hyper-pigmentation of aged skin. The most common side effects are peeling, excessive dry skin, burning, stinging, erythema, and pruritus. Photosensitivity also occurs. Therefore, sunlight exposure should be minimized while using Retin-A Micro.
There's a definite correlation between Retin-A and skin texture/scarring complaints. There's no denying that. It's more than likely an indirect connection, but it's there none the less. It's been a worthy enough user complaint to warrant a warning at least. I don't see anything wrong with acne sufferers sharing their experience with the product. Skepticism is healthy for consumers. Use what you want, there's plenty of products with various levels of apparent success/failure. So, it's okay to put that out there and ultimately everyone can take that information how they want. 
DudleyDoRight, I completley agree with you. There is rampant misinformation and pseudo-science out there, mostly from people who aggressively push the natural / organic / holistic approach to everything. I am all for natural living, but I do not think it is the solution for every single ailment out there, acne scarring included. I am an advocate of hard science, and Retin-A has a nearly 40 year record. That's not to say that some people don't have negative reactions.
Retin-A thins the stratum corneum, but THICKENS the dermis, so while the top layers are being thinned, the overall net effect is that it thickens the skin.