When I first noticed what I thought was a swollen lymph node on the right side of my neck, I thought it was just an infection coming on. It didn’t hurt, but it was swollen.

The swelling went down a few days later and then would swell back up again. It did that for the next few months. By March 2020, it had not gone away, but due to the COVID-19 pandemic, I put off going to the doctor.

In June, I requested an ultrasound from...