Tretinoin
"I've been using tretinoin in the 0.1 gel form for almost 2 years and let me tell you it is possibly the best skin product you will ever own. //The beginning is hard, naturally the skin needs time to adjust so for the first few months of treatment you will experience a lot of redness, patchiness and obviously flaking and you may also experinece periods of very ugly break outs if u have many clogged pores hiding under the surface as the retin a will exfoliate the skin and slowly 'activate' ur pores to enable them to unclog without the need for manual extraction and without scarring. the key with retin a is patience, SPF and lots of moisturizing. do not quit before ur skin gets better and resist the temptation to extract acne yourself. G Luck."