Garlic is known for its anti bacterial properties and makes an excellent acne treatment. Press some garlic into a paste and leave it on your acne and pimples for 15 minutes then rinse off. Another solution is mashed-up honey and apple, applied individually to pimples. Also, try dabbing some tea tree oil on the pimple to dry it out and kill any bacteria.
There are some excellent natural facemask treatments for acne. Try applying a layer of ripe tomato pulp, cooked oatmeal or egg yolk to your face and letting it dry.
Finally, fruits are natural acid exfoliants and can help to get rid of your acne scars. Applying a puree of pineapple for 15 minutes will both freshen you up and reduce the impact of acne marks. Another great solution is lemon juice, but be careful as it can make your skin more sensitive to sunlight.