Is there a place that specializes in effective surgical scar treatment?

Due to surgery, from below the neck to the middle of the chest

A large scar has formed up to the middle partㅠㅠ

Is there a place that specializes in effective surgical scar treatment?

My house is in Paju, Gyeonggi Province.

If possible, it would be better if it's in Gyeonggi or Seoul area!