Questions about back acne treatment and management

I am worried about back acne that won't go away. Are there any effective treatments or management tips?
As the weather gets warmer and we start wearing lighter clothes, I am very worried about the skin problems on my back.

Unlike the face, it is hard to reach and difficult to manage, so perhaps that is why it keeps leaving scars and new ones keep popping up.

I have tried changing my body wash and paying attention to it in my own way, but I haven't seen much effect.

I am wondering if there are any sure ways to improve this in daily life, such as through diet or showering habits.

I desperately need the know-how from those who have completely cured their back acne.