Bests & Worsts Reviews from Amazon

I am a dark skinned indian girl cursed with black, thick facial hair. I bought this to use while I went away to school to keep my eye brows trimmed and my upper lip, chin, and cheek hair free. My mom noticed that on all the areas where I was using this, my skin was starting to develop dark, shadowy spots (similar to a guy after shaving). I stopped using it every where besides trimming my eye brows (careful about over doing it though). The dark spots are taking a LONG time to go away but now I thread and tweeze. Please do note that this is my personal experience and it could just be my skin that had this type of a reaction. It could also be something else entirely.