I Can Feel my Neck Muscles After Chin Lipo - What Should I Do?

I can feel my neck muscle (with my hand) after chin lipo. I could not feel it before. I feel it right in the middle of my neck like a straight line going from my adam's apple to just under my chin. It is very tight now. Before it was not. When I look up, I really feel the tightness. Should I keep stretching it by looking up? Should I massage it? What can I do?