I used Retin a 0.1% everyday for 2 weeks now and to say the least it has been a nightmare.I have developed severe acne, dark circles, red eyes, wrinkles,conjunctivitis,thin skin. I NEVER had any of the above.I'm still in my 20's. Please answer all! 1. Are the side effects of Retin A- dry crack/wrinkles,dark circles, thin skin permanent?(all 4 side effects reversible?) 2.Is Retin A effective on stretch marks? 3.I am too scared to continue using, what will happen if I discontinue using?