Butt crack rash. help!

i just got butt crack rash. it sting it itchy and it's killing me. it hurt every time I move my lower body part and I can't sleep very well . I did use some A & D oinment, and I hope is help. if anyone have a solution how to get rid of it please share it, I rather get kick in the nuts than have this rash >.>
Butt crack rash. help!
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