What causes bumps on goldfish?

Many clients call our office with concerns about “bumps on goldfish.” Most of these growths are benign cutaneous tumors within the layers of the fish’s skin. (Technically nerve sheath tumors aka neurofibromas or shwannomas.) It is very common to have goldfish with a few lumps, bumps, nodules or growths; whatever you want to call it.

Are bumps on goldfish life threatening?

These growths are not of concern to the overall health of the fish. They do not cause any quality of life issues other than aesthetic ones.

Is there treatment for bumps on goldfish?

Sometimes, these growths can get very large, and due to resistance from a swimming fish, fall off and grow back. They tend to be highly infiltrative into the skin, so surgical excision is only a temporary fix. We have attempted to apply cryotherapy to several cases, with good temporary, but not long-term, resolution.

Bumps on goldfish

Mario, the goldfish pictured above, had multiple growths on his body and fins. This image was taken a few weeks after cryotherapy. The attachment of the growth caused the top portion of his tail to require regrowth, but you can see the lumps are not truly gone.

So, these lumps on your goldfish are really nothing to worry about. There is the potential for them to become abraded and require topical care, and they may fall off and grow back, but your fish’s quality of life will not be affected. If you are concerned about bumps on goldfish, contact your local aquatic veterinarian through the American Association of Fish Veterinarians or the World Aquatic Veterinary Medical Association.

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2 thoughts on “What causes bumps on goldfish?”

  1. Courtney Dittmar

    Hi, thank you for the above information. My comet has a slightly different lump forming on his neck appearing from under his scales. It’s sort of appeared in the last day and is actually pretty big for a day’s growth. It looks like it is surfacing to burst. I’ve not experienced anything
    like it on my fish and it seems different to what you’ve described above. Is this lump treatable? Could this affect other fish in the tank?

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