I ve noticed a lump, about 1/4 inch diameter, behind/below my right ear lobe for two or three days. Is this the site of a lymph node? No particular problems now, apart from the endless heat this summer in Southern California. I m 71, in good health, physically active, and the only cancer I ve had is a squamous cell carcinoma near the left eye seven years ago, treated easily with Mohs surgery. Most likely an unnoticed infection?