A dermatology P.A. told me that if I continue to use retin-a in a few years I will have broken blood vessels and really thin skin. Is there any truth to this. I have been using retin-a for 5 years and I also use glycolic acid 15% daily with a sunblock. My regular dermatologist recommends the product. I am worried now that I am doing more harm than good to my skin. I am 26 years old.