Elijah got lumps too.... didn't bother him and it's very common for this to happen. Sounds all normal but like anything, just keep an eye on him and if he gets out of sorts or anything strange then take him back. It's hard second guessing all this stuff sometimes and wondering if we should be going to the doctor!! I always use the rule of "go with my gut" when it comes to these things. If I feel unsure and nervous about it, I go. My doc is good and doesn't make me feel I'm wasting his time if it is nothing. Better to have a clear mind about it than to have it weighing on you.