Sweetie, sometimes this happens and it's nothing to worry about. with some vaccinations this will happen. just gently massage it for a little while daily and it'll go away soon. this happened to Tigger not too long ago (last week) and it's starting to disappear. I talked to my vet, because I was worried just like you and he said its normal for some puppies. he didn't tell me to massage it, but I found that it helps. good luck, and don't worry,