A related discussion,
Butt Cheek Breakouts - Herpes was started.
Your new question should have been posted as a follow-up here. Only a limited number of new questions is possible and unnecessary ones block others with new problems.
I told you above you don't have herpes and to see a provider if you were concerned. You did that and he confirmed you don't have herpes. So your new questions are irrelevant. And no, neck glands cannot swell as a result of a genital HSV infection. I already answered your question about the location of initial herpes lesions.
You don't say what blood test was done so I can't help there. You are now under a provider's care for this issue. This site is not a substitute for care by your personal provider, so that's the person to ask any further questions.
HHH, MD
Sorry, I misinterpreted "two other small spots on either side" as meaning you had lesions on both cheeks. But it doesn't change my opinion that herpes is unlikely.
But if you do have herpes, it is a recurrent outbreak and unrelated to your recent sexual encounter. Recurrent herpes episodes generally occur in the same spot each time; so see a provider promtly (within 1-2 days) if similar lesions occur in the future. But still, herpes is a lot less likely than other possible causes.
I'm sorry I wasn't clear, all three spots are next to each other on the right buttocks, doesn't sound like this will change your response?
Also, I don't think i've had any other symptoms. I guess, my real questin is, is the buttocks a likely place for a herpes outbreak when I had heterosexual sex? I am a 25 yr old male.
This could be any of all the many things that could cause red spots or irritation anywhere on the body, like acne, folliculitis, etc, etc. The only conceivable STD is genital herpes, which can occur on the buttocks--but initial genital herpes infections almost always involve the genitals, not the buttocks or other nearby areas. And if you had recurrent herpes, acquired sometime in the past, you would not have lesions on both cheeks; recurrent herpes is always limited to one side of the body.
Therefore, these spots are not an STD and have nothing to do with your sexual encounter a week ago. Of course see a health care provider if you remain concerned.
Good luck-- HHH, MD