Hi there - the lymphedema, and parathesia could very much be related to surgery and treatment. They cut your tongue and muscles in your neck and remove a bunch of stuff then then cook it!!! the parathesia could be related to nerves coming back to life - or nerve damage. Lymphedema could worsen it. Or he could have an infection. I'm going to triple the motion - it's possible it's nothing but he should see his dr. No need to suffer, and if he does have an infection it should be treated. Paul answered your question about recurrences and I know this is always a fear, but he needs to be looked at. Hugs and hoping for the best!