What is the best way to manage acne?

Acne management is always a concern...ㅠㅠㅠ

Acne scars and acne red marks, things like that, don't seem to work no matter how hard I try to manage them at home. Hmm, I think the answer to acne management is to get them treated at a dermatologist... I've always put it off because I thought it would be too expensive and complicated.

Is there a way to treat acne at a reasonable price?!? ㅠㅜㅜ Thank you!!!