Hi, any lip issues your having would not be related to recieving oral sex as std,s dont travel inside your body
Your lip issue is not related to receiving oral sex and if your groin node swelled up about a week after the last encounter that would be a symptom of genital herpes recently acquired But the swelling should be accoumpained with flu like symptoms and even before any of this, a penis blister type sore should have appeared. If only the node was involved i would not be to concerned its herpes as if the last person did not have any lip sores at the time, your risk would be close to zero anyway.
So to answer your question, a swelling node is a symptom of fighting an infection.
Also with syphilis, you would have a chancre sore developing not just a swollen node so no chancre, no syphilis.
Oral is zero risk for hiv
Does anyone know what it might be