Can anyone give me a second opinion on this.. help would be appreciate

hello, i have this red marks on my pubic hair area. ive never had unprotected sex before nor does it hurt when i pee or any fevers or discharge or any symptoms like that. I have trimmed my pubic hairs before using a trimmer and got a bump similar like this that got big and then went away. I've had this red mark for about a month now and doesnt seem to change at all. When i had that first bump i got an STD test at planned parenthood(peed in a cup, blood drawn, and finger picked at) and everything came out negative. I'm just not sure if they tested for herpes or is that what is tested for with the blood test? I really appreciate any help, its been eating away at me.

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if anyone could help..

herpes manifestation on skin doesnt last for a month,relax,this is not herpes
and no they dont test for herpes only if you ask for it

do you have any idea what it could be?

im not a doctor so i wont missguide you,if it was me i wouldnt worry at all