Please recommend a dermatologist for acne treatment.

I had a lot of acne during my teenage years.

It almost disappeared after I became an adult.

But I have a small pimple under my chin.

It spread out from one place to the side.

I went to a dermatologist and got acne treatment for 50,000 won per session.

I even got a shot for my whiteheads.

It didn't improve

Please recommend a dermatologist