Interesting you brought this up. I'd bought some 10% glycolic acid cream a while ago but was hesitant to actually use it after reading more, but finally decided to try some spot treatments on some face dark spots. It tingled! With cream you just leave it on, so I applied not just a rub in amount, but a 'blob' on the spots. After a day the spots became red and a bit inflamed and stayed that way for a couple days. After that they scaled off and seemed to look better.
With that, I tried using the cream (as intended rubbing a small amt in) on my entire face and arms. It also tingled a bit, but just produced a rosy glow and no further irritation. Next I redid the spots with 'blobs' and same result as before, perhaps even more inflamed. Although the directions say "for day and night continuous use", my skin appears too sensitive for that, so I just waited for about a week or so. Soon enough the scaling and scabs from the 'blob' applications are slowly coming off to reveal a better much smoother skin with less coloration.
I've read that it can takes weeks or months for complete results, and so I'm definitely encouraged with what it's done so far and will use it, say, every 10 days to 2 weeks.
PS. Sun seems to be an issue, so I'm doing this in the Colorado 'winter' when UV is very low (like now). I don't think I'd dare try it in the summer as the UV rays in my mile high area are very intense then.
Edited by Oakman, 15 November 2019 - 02:43 PM.