When I had my facelift I was advised to massage the submental incision as this area often forms a ridge or the sort of tight lump you describe. I think the discomfort you describe upon swallowing is due to the plication of the platysma bands or whatever technique they used in your lift. Darla - I was interested in your response regarding massage under the chin. I am considering massage but haven't had a chance to ask my ps. You may very well disrupt internal sutures, disarrange tissue or otherwise compromise proper healing.
Every face is different as are the techniques employed by different surgeons.
Some techniques cause varying types and degrees of discomfort and changes in sensorium. Unless you are in PAIN, it sounds like you are experiencing normal sensations. This uneven look really bugs me. Repeat violators of healthboards policy will be permanently barred from the boards.