Wanting to cover unwanted birthmarks and blemishes is a common need. There are products on the market like camouflage makeup that are invented to cover dark areas. The make-up lines Dermablend and Coverblend both have corrective cosmetics strictly formulated for your body and legs that does a good job covering birthmarks and other spots. Bleaching creams can work sometimes, but you have to be extremely careful when using them and should consult a dermatologist before attempting to bleach the area. Lemon juice may help but probably won’t do much to correct the problem.