My husband had the same experience four weeks after. He still had a lot of face, neck swelling at the time. We went to the Dr. because the fluid leaking was yellowy green in color and it was infected. It was a good thing as we would not have known of the infection otherwise. He was put on antibotics but told to let it drain freely. It leaked for several days which was great because most of his swelling went away. Hope this helps.

CG 2 Emmett,7/09 DX SCC rt tongue. T2N1M0, 1 node, marg neg.4/10 PET/CT clear, 9/10 C back. 10/10 Rad hemi, 2 tmrs mod diff. resec flr of mth. Flap 4 nodes/w/ext cap. 11/10 Peg, CX3 HD, 30 rad. 1/31 & 3/21 6/11/11 - PET/CT "activity" 9/11-all Clear. 12/11 peg out. 2/15 still all clear! 9/14 Prostate cancer treated with pencil beam proton therapy, best radiation experience. Keep it in mind as a treatment option for all tumors that can be seen including head and neck.