Carrot has a weight of 1075g that have not changed in the past 2 weeks (I've been weighing him every day as he has had some repiratory issues). He is male and just passed his 4th birthday. He has been eating normally. He's a smooth haired guinea pig and male.
Today when he was out on floor time I noticed he had a swelling around his chin/neck area below his mouth. I picked him up and one side was hard and considerably larger that the other. It felt like a hard lump. It was covered by fur, so hard to see unless from the right angle.
Anybody know what it is? Should I take him to the emergency vet or see how he is?
I have also posted this on GuineaLynx forum but nobody has replied yet and i am very worried.