I brought home my first guinea pig, Pip-Squeak on Sunday. I've been giving her plenty of TLC and she's doing great, however, I just felt a pea sized bump behind her ear and a smaller one next to it. I swear I didn't feel it last night. I am very worried. It looks like it's some type of cyst and on the verge of popping. What should I do? I cannot take her to the vet today. I'm very concerned. It doesn't seem to hurt her. Is there anything I can do myself?