I have dark spots on my legs which cover the whole backside from feet to knees and appear as spots on the frontside and innerthighs. I have no idea when they appear first. But they weren't from birth. I have exposed to sun so much as a kid but this spots reach the bikini line which is not exposed to sun because I don't where short clothes. And in one leg they are worse and there's a big very dark spot which makes me feel much more unconfident. How can I get rid of them and have even skin?