Hi, roughly 3 1/2 yrs ago, I had base of tongue cancer. Had the neck disection and 1/3 of tongue removed and reattached the good. roughly 2 1/2 yrs ago, got Melanoma on the left side and had the Sentenial Node removed which came back clear. Roughly, 1 1/2 yrs ago, I felt a small lump which was I thought another start of cancer under my left jaw area.
I thought it was a Lymph node starting to get bigger, the Surgeon checked it out and I am fine. Good on you both for continuely checking. Hopefully, your Doctors are spacing your visits between them as to have a set of eyes in him every 3 months for the first 2 yrs. My Doctors have switched to seeing me every 6 months, but I split it so I see one of them in 3 months intervals.
Take Care