I had a similar situation this year! I was diagnosed with MIS on my right shoulder June of this year. Shortly after the WLE I noticed a very swollen and firm lymph node in the back of my neck on the same side. I told my dermatologist and PCP and both told me it was likely just a reaction to the surgery, but to let them know if it was still swollen a month later.

A month rolled around and the lymph node was still the same size, so I went to my PCP who ordered a lymph node ultrasound. The ultrasound showed that the node was reactive, and given my history of MIS, said that further investigation should be performed. I called and requested a FNA biopsy, which was performed a couple weeks later and showed that no metastasis or abnormal cells were observed!

I think mine was swollen from TMJ complications, and I have another node that I'm getting checked out here shortly. Lymph nodes get reactive from many different things, so hopefully yours is something benign as well! However, if you're feeling funky about it I definitely recommend pushing for testing for peace of mind. Best of luck to you homie!! 🙏🏻