Lemon juice is often found in natural remedies to best acne scar removal treatment. Lemon juice is a citric acid that helps remove dead skin cells and stimulates the growth of new cells while improving skin elasticity. Before apply lemon juice to acne scars, clean the scars with warm water first, then simply use a cotton ball to apply the lemon juice on to scars. Leave for 10-15 minutes before rinsing. Be sure to apply sun screen before going out in the sun as lemon juice makes your skin photo sensitive.