I am the worst when it comes to making sure Raiden goes to the vet any time I find something suspicious. His vet is 2 miles down the road, so it is easy and convenient and I can just walk in there with him and have him examined. I'd hope his only visit is his annual wellness exam and vaccinations, but we have already been at the vets three times this year. And he has an August appointment for his dental cleaning.
Clare, if you are concerned, which you are, I'd take Pearl to the vet to have it checked out -- or at least CALL the vet and ask the question. If they think it could be serious, they might want to see her. Don't just assume something is wrong, or it's normal. We'd all be veterinarians if we could do that! LOL