I used Tri-luma in the past to get rid of three hyperpigmentation marks above my lip caused by pimples. At first the product seemed to fade the marks, but then they came back darker and bigger. Now it looks like I have a mustache. I call it my scar-stache. Not cute.
Anyway, some people love that stuff, others have had rebound darkening like I've experienced. Personally, I wish I never would have used it. The marks really weren't that bad to begin with and I've only made them worse.