Herpes en la nalga? Incluye foto

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the last time i had unprotected sex was september 2 i have been checking myself everyday since and have found no blisters or sores i just found this today about 3 weeks later. it itches around the area but not too bad. there are no fluid filled blisters just pimple looking ones around. can it be from irritation? or does it look like it can be herpes.

it could be a rash but you should have it checked out before they go away