It is probably a tumor. I'd guess it is benign, as I've heard of more than one ferret with a benign tumor on the end of its tail. You should take your ferret to the vet, as this is not normal and could be harmful.
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It's a tail.
Shunosaurus had a round spiked tail. Stegosaurus, also had a tail with four large spikes.
The end of it's tail
The boys discover a large rock, which they name Castle Rock, at the tail end of the island. They also find that it is a more desolate and uninhabited area compared to the rest of the island.
ferret marmot elephant cat rat
The tail is the end with the smaller
It's kind of like a large sausage shape with a leg at each corner and a tail at one end and a large cat like head at the other end
Having your goldfishes tail turn white could mean your goldfish is sick but it could also just be new tail growth.When goldfish grow new tail tissue it may appear white or grayish.This usually happens when a goldfish isn't fully grown .If it is new tail growth than it will be on the end and tips of the fish's tail not the whole tail.
First the tail stock then the flukes are the part at the end of the tail.
The tail end. :)
tail