How to get rid of white acne scars (bumps) on back? (photos)

Hi I have had these white acne scars on my back or I don’t even know if they are acne scars or what they could be called. I’ve done a total of almost 13 treatments of chemical peeling and microneedling but still didn’t see any improvements. My dermatologist said that the only way it could be improved is by chemical peels, but I got a little impatient after so many treatments and no improvements. That’s why I wanted to ask if there is another way to improve their appearance? Thank you