My betta fish has a small ball on its bottom fin. What is it?

Question

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. Pet's info: Fish | Betta | Male

Todd Cecil · Accepted Answer

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.

My betta fish has a small ball on its bottom fin. What is it?

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