How do i get rid of dark spots on my legs caused by pimples?

Skin discoloration: Any sun exposure will continue to keep the dark patches noticeable. Your best option is sunscreen or long pants or skirts to keep the sun away. It is not common to have pimples on your legs, so you might want to investigate if the breakouts are from sensitivity to a fabric, a detergent or softener. Sweat can cause a rash. Don't pick at any breakouts as that will only increase the pigmentation.