I started using a 1% retinol about two months ago. Initially, my skin looked awesome, then about a few weeks later, my skin got really bad. I now have blotchy skin. I'm not sure if I have developed melasma on my cheeks or if this is hypopigmentation along with hyperpigmenation. After stopping the retinol (which I only used twice a week), my cheeks still have a burning sensation and feels very sensitive. I use sunscreen everyday and it is winter with hardly any sun. I am very concerned!