bump - herpes or irritated hair follicle? *pics*

hello! i have just been tested and did not test positive for any std/sti, but it has not been 3 months since my last sexual partner. i recently noticed a strange bump between my vulva and anus, and am slightly concerned it looks blister-y. it is not fragile, as i messed with it a bit and it did not pop. i have very easily irritated hair follicles as i have hidradenitis suppurativa, and am curious to know if it looks like an irritated/infected hair follicle or if it looks like a blister that could be from something like herpes. it is the only spot i have, and its not easy to see unless i pull my skin around it to be more taut. pic:

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