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My betta fish has a strange lump, but seems healthy. What's wrong?

Updated On September 23rd, 2025

Pet's info: Fish | Betta | Male

I noticed my roundtailed betta fish has this strange lump/bump/spot on him. His tank is at the optimum environmental levels, he swims and eats without problems. I'm new to having a betta fish, so I'm not not sure what this kind of spot means. Hopefully the pictures will attach this time.

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1 Answer

Most Helpful Answer

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Answered By Todd Cecil

Veterinarian

Published on February 20th, 2020

Thanks for reaching out about Spike and including a photo. It is difficult to visualized the lump on the picture but if water quality is pristine, a veterinary visit might be in order to assess. Bumps/lumps can be parasites, infections, enlarged internal organs and more. Monitor appetite. Containers of food should be re-purchased every -23 months as vitamin C degrades quickly and fish has a nutritional requirement for vitamin C. If not a new fish (owned for several months or more), unlikely to be parasitic problem. Good luck.

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1Pet Parents found this answer helpful

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