My betta fish has lumps behind fins. Should I worry if he's fine?

Question

My betta fish has a lump on both sides right behind his fins. He swims, eats, and poops fine. I'm just worried that it might be something bad since I've never had a betta fish before. Should I be concerned about the lumps? Pet's info: Fish | Unknown - Fish | Male

Dr. Massimo Orioles, DVM, Cert AVP, MRCVS · Accepted Answer

Even though a picture would help to determine specifically the underlying cause, these kind of lumps/growths need to be ideally assessed by your veterinarian to have a definitive and specific answer. Usually there are two ways your vet can do that a part from examining it directly during physical examination. A biopsy can be taken under local or general anesthetic, otherwise a smaller sample through a fine needle can be aspirated (this technique is called FNA= fine needle aspiration). Differentials include skin cysts, infections, benign or more sinister type of tumors. Hope this answer was helpful, but please do not hesitate to contact us again on the forum or by requesting a consultation if you have any more questions or to discuss it any further.

My betta fish has lumps behind fins. Should I worry if he's fine?

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