First, you can use lemon water/juice. Squeeze the juice out of the lemon then apply it on the pimples or acne for like 5 minutes. Repeat the process twice or thrice a day for 2 weeks or three and if there are no results, then you can try using aloe vera. Aloe vera is the best home remedy for pimples and acne. Just like lemon, you cut a piece of the aloe vera plant the rub the juice against the pimples or acne for some time. Repeat several times a day. Honestly, you cannot cure pimples and acne within a week using natural ways. If so, then I suggest you try applying chemically made oils and also you can consult your physician to give you the right cream. Even with the cream, you should apply it thrice or twice a day to facilitate the results.