my brother's skin cleared up by accutane, but it has a lot of side effects that you have to be careful.
i used a product called natures cure, it is a homepathic herbal treatment you can buy from drugstore.com and just type in natures cure acne medicine in the search engine.
i am 33 years old and i had the same problem as yours. the dermatologist gave me rentinA and it only dried my skin up so much i couldnt even open up my mouth.
i tried the natures cure acne medicine and my skin cleared up, it is really cheap and you can also find them at some walgreens, or cvs stores.
you can atlease check out the website and ready the reviews about it.
this stuff worked when nothing else wouldnt. it explains why you have acne even as an adult. try to find their website.