On the right side of my neck, I found a bump starting at my jaw going down about an inch. I also have a minor sore throat. I first noticed it about a month ago and it can be pretty painful and tender at times and then 20 minutes later the pain and tenderness will be completely gone. Also whenever i swallow my ears pop a little, Not sure if its related but worth mentioning. I smoked cigs for about 2 years, 6-8 a day and quit about 2 months ago. Also, I smoke weed occasionally and right after I smoke the lump becomes tender and painful. What could this be? Could it be cancer? I have been pretty worried about it. Thanks.