Speak to a dermatologist. Also, your local pharmacist can be a great resource.

You should not need to apply any medicine. This is due to hormone's change. Have good diet which includes fruits specially apple. Have some green salad. Avoid all oily foods specially burger, pizza etc.
Every morning after wake up wash your face with cold water. Then after few times take half cup of pure milk (without boiled)and wash your face then after 5 minutes take some ice cubes and bundled them with a clean cotton cloth and put them on your face where you have pimples.
Do continue this for some time.
I hope you will get best results. :)