I have a lump under my jawline, about the size of a golf ball, but it occasionally shrinks in size. It doesn't hurt, and shifts slightly when I touch it. I went to the doctor, who told me that because it's "mobile" it's probably a blocked gland, but definitely not cancer. He also recommended an MRI, which I got. Upon examining the films, he now wants me to get bloodwork to rule out lymphoma, which he says is rare. Still, I'm very nervous about it all.