Help! How to heal this thing!?

Ka

So yesterday I noticed I have a rash on my butt/thigh. There are 2 large red irritated bumps in the same spot on the two body parts. They rub each other every time I walk/ sit. I take showers every day and am clean. So idk what this is. Anyone have any idea of how to soothe it? I tried putting lotion on it (that’s the white stuff around the rash) but it burned so bad.