What is this on my butt cheek?

Okay so this is on my butt cheek. It has no feeling to it whatsoever. It doesn’t itch,burn, or hurt. It’s like I forget it’s there until I look at it. It has also never blistered up or crusted over. I feel completely fine. No flu like symptoms or any aches. It literally just feels like a dry patch of skin. I’ve recently started using hydrocortisone on it. Also about a year ago I was diagnosed with this fungal infection that created bumps and rashes on my face and under my nose but it is mainly just common in that area. I took antibiotics for it and used a cream that made it go away. My vaginal and anal area looks completely fine. No sores or blisters or weird discharge or smell. The first picture is what it looked like when I first saw it (in late October) and the second picture is what it looks like now. I’ve looked up so many different skin problems, including herpes, and none of the pictures have matched these! Any help would be great. Thank you!!