How can I get rid of these?

I actually don't know how my butt look like and always thought they're fine as hell. Up until my ex and I got intimate and he asked what happened to my butt, and has it always looked like that. So I was confused and looked

onto the mirror myself, and yeah saw these... Can you help me with a remedy tho? 🥺 It made me feel conscious as well specially when wearing a bikini. Help meee