Hello, my betta fish has a small ball like formation on his bottom fin, ive had just noticed it today and i am not sure on what it is.

Updated On December 6th, 2018

Pet's info: Fish | Betta | Male

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Answered By Todd Cecil

Veterinarian

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Thanks for reaching out about Fred and including a picture. It is difficult to identify on the picture, but there is a small spherical red mass not he left lower body wall, that could be a wound, hypertrophic (enlarged) skin cell, or other concern (neoplasia). The recommendation is to monitor the mass for growth and if increases, seek an appointment with a veterinarian with experience in aquatics. Good luck.

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