i used retin-a and my skin around my mouth got darker....now it's to the point where it's BROWN and noticeable...should i stop using it or keep using it...is this going to go away!!!??!!? I use sunscreen and the spots around my mouth are still darker! It's like a brown discolouration=( helppp what can i do to make it go away...should i apply lemon to it or will it make it worse? anything to lighten it, pls help


