Our members have answered you fully with a suggetion for you to see your own doctor.
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A syphilis or herpes sore doesn't look at all like a pimple, and your doctor can tell the difference.
A syphilis sore lasts at least a few weeks.
I'm not sure why the doctor gave you azithromycin if you had no infection. You should ask.
I've noticed you keep posting a lot and we're volunteers here. IF you can't wait, please go to your doctor. Otherwise, you have to be patient and with the US holiday, it could be a few days before you get any answer here. Please don't keep posting this same question everywhere . I get the sense that anxiety rules your thoughts. This is not the syphilis forum, but syphilis isn't a pimple, it's a sore. Different. You had protected sex which makes it low risk for herpes or syphilis and you went to the doctor who gave you an antibiotic. You healed but still see something. A lymph node just means you had an infection and yes, you already knew that because your doctor treated you with an antibiotic. That you still see something on your skin has nothing to do with herpes or syphilis. My heartfelt suggestion is that you work with a therapist on your health anxiety.
And also I forgot to mention that the encounter was so short I think 1 minute coz I quickly ejaculated