If I would have acne I would would go to a dermatologist, there they could help you for sure. It's their job.
However if you don't feel don't go to a dermatologist, then you could always read some articles about acne. The most websites would try to sell you a product, but i wouldn't buy them because they are mostly scams. Just read and you'll find your answer.
In my opinion a dermatologist would solve your problem instantly.