is it mild or severe? If severe, ona Daktari.
As @Matata says, always wash your face before you sleep.
like 5 years ago had the same problem (but mild), and I solved it by increasing hygiene. This meant, changing my pillow cases regularly. One area many people ignore. You can be allergic to your pillow...not literally of course.
Also avoid solid oil, use lotion but avoid those many creams which claim to treat acne.. i'm sure your skin is oily..never sleep without washing an oily face. Never (for those who don't shower before sleeping).
finally, be patient. DO NOT be cheated that one day you will wake up and find your acne all gone at once. NEVER.
Life is joy, death is peace, but the transition is very difficult.