You can't use spells to change your body.
However, there are a few ways to get rid of them naturally. Take care of your skin by putting lotion on everyday. Stay hydrated, this keeps your skin healthy.
Apply lemon juice to the scars, lemon juice is a natural bleach and can help aid in removing skin cells. Be careful with lemon juice though, because the area in which applied to will be sensitive to the sun. So wear sunscreen if you are worried about that.
Exfoliate 3 times a week. Exfoliating your skin can help by removing dead skin cells, revealing the healthy, new skin under it. Your skin will also have a healthy glow.
You can also try using skin lightening products. But I recommend to only use natural methods. The chemicals in products can cause skin problems, and can make your problem worse.