I have a lump about the size of 1/3 a tennis ball on the left lower back of my head, I've had it about 2 years. I went for a check up about that time, doc felt it for 1 second and said it was probably a fatty deposit? I just learned there are lymph nodes there and now I'm getting scared. Im a 48 yr old white male with no insurance and a family history of skin cancer. Any info would be helpful.