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Betta fish has white lump on face and is hiding. What should I do?

Updated On September 23rd, 2025

Pet's info: Fish | Betta | Male | unneutered

Hi, I have a really important question. Recently, this past week, my fish has been growing a white lump/bump on his face. He’s a blue male betta fish. I’ve had him for almost a year and a half Andy this is the first time he’s had a problem. Hes also been hiding in his cave for 2 days now. Should I be concerned?

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1 Answer

Most Helpful Answer

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Answered By Angel Alvarado, LVT

Licensed Veterinary Technician

Published on March 30th, 2019

It could be an infection. Maintain pristine water quality via filtration and regular partial water changes. Use only conditioned water that is temperature matched to prevent stress or shock. Bettas do best between 78 F and 80 F. Look in the aquarium section of the local Petco for a broad spectrum treatment, such as Lifeguard (by Tetra) or Furan-2, to treat him. Follow label directions carefully and remove the carbon filter insert during treatment if indicated.

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