a year or so ago i noticed this skin coloured bump on my back that was never there before i thought it was a wart or something, but now its started to change colour its started from around the edges and turnin dark brown, and also this can be totally unrelated but i might as well mention it, i also developed a l grayish white patch about an inch and a half long and a cm wide on the skin between my vagina and anus can this be skin cancer

Any new changes in your skin should be checked out by the dermatologist. You could ask a gynecologist about the patch of skin in your private area if you are embarrassed. I would make an appointment soon just to be on the safe side.