lymph nodes (assuming they are lymph nodes) enlarge in response to infection or inflammation in their immediate anatomical neighborhood. it is important to investigate the cause of the lymph enlargement so your boyfriend will need to actually see a medical professional so he can be properly examined diagnosed and treated. not something that can be blindly accomplished over the internet. not knowing the cause i cannot offer you a patient-specific explanation regarding worsening symptom with sexual activity.
if you have swollen lymph nodes in your groin does having sex cause them to become even more swollen? . my boyfriend is worrying over a possible hsv in his groin. he had a worrying case a year ago as well but the doctor he went to lost his sample and is known to not be reputable. his lymph nodes are swollen again but the few bumps he has look like ingrown hairs. the lymph node swelling was going down last night so sex ensued but this morning they're even more swollen than the other day. i'm just wondering if when lymph node swelling is going down does having sex bring the swelling back up?