I don’t know if this is herpes or a rash(intertrigo)? Please help

ive had unprotected sex but that was about a month ago, my butt was itchy because i was sweating a bunch yesterday which i scratched a lot to the point where my skin is stinging, i woke this morning with stinging pain in the area so i looked and saw this

(sorry the pic is blurry i really couldnt get a clear one) does it look like herpes or rash? i google some things and found something that it could also be which was intertrigo

i would go get the sore tested
because the blood test seem to unreliable anyways