I've been using AHA for a week, putting it on after BP every night(everyday), with no moisturizer. I never use it during day (not gonna risk it). I've been using AHA as replacement of the moisturizer (as shown in one of Dan's videos). I never use it during day and always wear sunscreen. I make sure to be careful. The product is actually working. But I've noticed that there's a brown mark on my cheek/mouth area. Is this a scar or damage from glycolic acid? Is this normal? Should I use it twice a week only. Will that make it worst still? When I run my finger over it, the skin is uneven with a few tiny tiny bumps. It's a very light brown color. I have tan skin, so it isn't as noticeable. But I'm worried about it. What is it? And what should I do? Thank you for taking your time for reading this. I have a picture attached. Sorry it's blurry. But it's those brown spots next to my mouth.