Homemade Face Mask Recipes for acne scars. Acne occurs when your body produces excessive amount of oil that helps to lubricate your skin. Excessive production of sebum can clog the pores of the skin together with dirt and bacteria, leading to formation of acne. And, even worse, acne can leave some ugly scars on your skin if left untreated. Severe acne may cause embarrassing blemishes and may