Home bleaching kit?

Hello I have a really dark in relation to the rest of my body and it bothers me. Recently I purchased a home bleaching kit, I would like to know if there is anyone out there with some experience who could give me some tips on the process. I tried a bit of it on that bit of flesh between my tummy and crotch and it really burned and left this weird mark, but the lady I bought it from said it will go away after a while as my body only needs to become used to the chemicals.