Is it common for a lymph node to stay swollen

Patient: Is it common for a lymph node to stay swollen for long time ? Mine has been swollen roughly 2 months. I’m not sick just common allergies . Went to doctor and was given 500mg of amoxicillin x3 a day. 6 days later still swollen. It don’t hurt unless I mess with it. Should I be worried ?

Symptoms: Common allergies

Doctor: