i have quite a few moles on my back, sometimes they sting and itch really bad but that only happens every once in a while. my sister was looking at my back when she saw a black mole. i got her to take a photo and it was only tiny but pure black. i fainted/blacked out a few weeks ago twice and i have got told you get really sick when you habe skin cancer or whatever. just wanted to see if yous reckon i should go to the doctors？