Nodule?

[oacason27]

I bought a few swordtails online. This male has a raised tan nodule on it's fin. He seems healthy otherwise. Any idea what it is? I asked the seller and they said it looked like his coloring...but it's clearly a raised bump. The new fish are in quarantine so no worries there. No issues with the other fish.

 

[Sgooosh]

maybe its just a cyst

mostly they dont affect the fish's health

 

[emeraldking46 97]

maybe its just a cyst

mostly they dont affect the fish's health

It does look like a cyst... In that case, it's not something contagious...