My goldfish has a big brownish grey lump on it's head?
It is right above the gill. It is brownish-grey and can sometimes look purple. It is right behind it's eye. My goldfish looks healthy, it has a clean tank, correct water levels, eats well and looks happy. It is a common goldfish, not fancy. I only noticed the lump today at around 12 'o clock. None of my other goldfish (in the same tank, another common and a black Moore) look infected. The lump is round and about 10 mm all over. It has red blotches on the lump as well. Is it a tumor? Thank you, really appreciate you reading this.