My cat has had a growth on his front paw for many years. It looks like a purplish brown bean. Many years ago one vet popped it and it seemed like a blood blister. The vet I see now never seems concerned about it. Just wondering what it is! These days it is getting bigger and now looks like a smaller growth on top of the original growth. It doesn't seem to bother my cat but I sure would like to know if anyone else out there has seen one their cat.