tail injury

Our little Queen, Daenerys injured her tail last month. It’s unknown how as she just waltz in to our sons room when we were all playing sporting a new crooked tail... but all my research says that tail injuries are mostly from falls. This would make sense because she is by far the clumsiest cat...

Ack, just wanted to check if anyone had seen a tail injury like this? Molly has a lump (about a nickel-width) on the underside of her tail, about halfway down? She can still hold it up and swing it around like normal, no bruising or redness. I have no idea how she might have injured it, or...