Lumps on my Fish.

My fish have lumps. That's the recent phone call I received. A friend of mine was calling to say several of her really large goldfish had these huge lumps on them. What do I do? she asked. She was already buying Melifix to put in the pond and thinking about big parasite treatments. She emailed me these pictures of her dead fish and was worried that what ever they had would be catchy to the other fish in her pond. I asked her to quit throwing her money away on these sort of pond additives. While I couldn't say what caused the fish to die, the lumps were probably not the cause. Possibly a symptom of a poor immune system, but not the cause. I have seen cases like this before, usually always on goldfish. To the best of my research they are actually skin tumors. They are hard pimple like lumps that are often bumpy in texture also. Being tumors they are not life threatening and a fish may live a normal life so long as they don't get too large. Still do not know why they died. The pond owner had not a single water testing kit. (As normal) The rest of the fish in the pond seem to be doing fine. There were no other ulcers, but the fish looked grossly bloated in one picture. So the mystery of their death remains.
On another note, it will soon be August. July was brutally hot. I heard one pond club member's pond was 97 degrees! Surprised he didn't loose all his fish. At home we've been doing water changes to help keep the water cool. I brought the last of the baby fish out of the basement pond and put them outside. Basically, got tired of taking care of them. Put them in the bottom pond where they will find lots of natural algae on the pond walls to munch on. Surprisingly they have joined right in with the rest of the fish. Usually they stay alone and hide in the deep corners of the pond. The outside pond is actually warmer than the inside pond, so they have to be liking that. Bottom pond continues to do fine, actually looking a little crowded again with all the little fish bouncing around now. Upper pond still shows low signs of ammonia and nitrites. Still has a little green cast in the water. Its killing Harry to not be able to feed them several times a day, like he wants to and does the lower pond fish. Took the net off the upper pond for a recent pond meeting at our house and haven't put it back on. So far, so good. No jumpers. I'm loving the new pond and being so close to the fish. Easy to flush the filter, and well...I just like it all around.