flintstones
Senior Guinea Pig
Sounds identical to Africas 'neck' lump. I haven't even bothered with the vet, it doesn't hurt, isn't attached and is hard marblish size too, not attached. It hasn't grown and he's had it at least a month now. He hasn't changed behaviour or habit either. Do what you think best, but think twice about ops of course, if it can be lived with then its best too =] I just check Africa every now and again to make sure it hasn't grown.
It is her gland that is enlarged, so she being treated for an infection, if it doesn't go down she will be back next week and the vet says they will try for a sample but hopefully it will be fine and will go back to normal size.