Serious Help With Acne?

Okay so I've had very minor acne problems since I was about 13, and now I'm 16, it's a few days until my prom and about a month ago my chin broke out in tiny spots. At first I wasn't worried, but now my prom is on Friday, and I have about 4 cysts on my chin. They are all fairly small but they are still there! I have tried some medications before such as that oxy benzoyl peroxide stuff and tea tree wash and other various things, but is there absolutely anything I can do between now and Friday to get rid of these things, and prefreably at home as I can't get to any shops. They make me really upset actually, and I feel so ugly.. I know having acne doesn't make you ugly, but I have never felt so ugly in my life and my prom is sooon! Please help!?!?!