I have a 7 month old female holland lop. Over the past month and a half I have noticed a lump under her chin that has been growing for a while now. She acts completely normal and is as jumpy as ever. I felt it and it feels like fatty skin and lots of fur. I have seen bunnies with the same kind of thing but not as big as this and this is more under the left part of her chin and neck aria. I'm starting to get concerned that this is not normal.