What is the most effective treatment for adult acne?

My friend's daughter had a lot of acne on her face since high school, probably because of academic stress.

Now that I'm in college and older, I thought my acne would go away.

My acne just won't go away.

I'm a third-year college student now, so I've been suffering from acne for quite some time.

I guess now is the time when I want to dress up and go out.

I keep wearing makeup to cover up my adult acne.

That also clogs pores...

As a result, it kept getting worse and left scars.

As far as I know, I think you've received a lot of different treatments at dermatologists.

I think it's more difficult to treat than it was in high school.

I'm wondering if adult acne is inherently more difficult to treat and harder to heal.

I would appreciate it if you could tell me what are the basic treatments for adult acne and what treatments are available to get rid of acne scars.