I have a 2 1/2 year old son, and recently I discovered a lump on his neck. It's located right between his collarbone and ear. It's not a hard lump, but soft to the touch. (For example, the way it feels when you press on a vein on your hand.) It's about the size of a dime, and he flinches when I touch it. Otherwise, he doesn't seem to notice it, and he's acting normal. I'm going to try to get a doctor appointment tomorrow. I have a nurse friend, and she looked at it. She didn't know what it was, but said it definitely looked abnormal. Any ideas on what this might be?