A dermatologist will give you pills called Diane-35, but this IS NOT recommended for birth control, it is like a birth control pill but its intended use is to clear up acne.
Now, you can take until your acne clears up and then stop after a few months, but your acne may return; especially if it is due to hormonal issues.
I had terrible acne for years, always around my period, I also suffered from scarring. Now the pills do help, but my dermatologist insists I keep taking them, although I want to be back on my birth control pills for the obvious reason.
NOW....before you try this you may want to try a couple of creams from a dermatologist. Although they can be costly if you dont have a good drug plan (50 bucks each)
But they are called, Differn, which is used at night and Benzaclin which is used in the morning to dry out your pimples, although they can dry your skin and you will need to use a moisturizer over top.
Hope this helped