Bump/Cyst on base of dorsal fin.

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katas

Aquarium Advice Apprentice
Joined
Jan 1, 2015
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31
Location
Connecticut
Any ideas what this is exactly or how to treat?
 

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Was hard to tell but I'm guessing that as well. Cysts that I have seen have come and gone fairly quickly. If slow growing might be lympho.
 
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