| A Melanoma is a tumor that is commonly found in ageing grey horses, although they can be found in horses of all colours.|
They are usually located on the underside of the dock, around the anus, the vulva, the sheath and on the head. In hairless regions of the horse's skin, Melanomas have a black, knobbly appearance. If they are on the head, they are usually covered in hair.
Melanomas only require treatment if they ulcerate and become infected. This occasionally happens with large growths under the tail. Melanomas are not routinely removed because they often regrow and they usually develop in sites that would be awkward to operate on.