How do I get rid of red marks on my butt ? Or is that normal?

I got them right after I had sex with this guy at his house, on his floor.. and when I tell you it was dirty it was bad

( before you say why did you do it when you knew it was dirty, I honestly thought a good shower after was gonna be fine and I mean it was really good, I wasn’t thinking about it in the moment😭)

and I think that’s why I have them, kinda like acne but like they are just like red sports, no bump.