What is this growth?

[GalLuvsAxolotls]

This growth has been slowly growing on my axolotl, and I am wondering if anyone knows what it is. Is it cancer? None of the other axolotls in the tank are affected by this.

Thanks for any help!

 

[auntiejude]

Its almost certainly a tumour of some kind. I'd take the axie to a vet for a biopsy and removal if needed.