Odd question

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Ok the crack of my ass is red, like a red line? I don't know how exactly this happened? It doesn't itch or hurt etc. I used to wear thongs, so I thought it might be that, but I hardly ever wear them any more as my bf likes other underwear lol. Any ideas? Any way to get rid of it?

I get that sometimes. Maybe you aren't getting clean enough? Or maybe you are allergic to your laundry soap.

It's possible for the skin there to get an infection, usually a fungal infection. Try some antifungal cream on it.