tail

I have been trying to research and determine what this could be that has appeared over the course a few months. It does not seem to hurt him or affect him in any way. Any information would be very helpful! Thank you!

I've noticed that my almost 2 year old boy's tail is looking really white at the tip. I touched it and he doesn't seem to be in pain at all. When he walks he raises his tail off the ground and the tip curls up slightly. Not sure if that's related. Is this something to worry about?