Hi there
yes diet is very important to ensure your skin is good -- of course genetics play a role too, but you can make it better!
The main things you should do are:
eat plenty of fresh green leafy vegetables and fruit -- these should be raw (as in raw salad and raw fruit)
lots of wholegrains (bread and cereals that havent been processed)
lean meats
lots of exercise
and there are plenty of good creams you can use -- find ones that are more natural
i wouldnt recommending any of my friends taking the medication they normally prescribe (except as a last resort)... Try it the natural way first, if you can and you may be pleasantly surprised.
Not sure if this is allowed, but as this site does not sell anything and is only an informational resource (please check it):
edit
acne is the first item there.
Shusheme