What is the shiny dot at the base of the Shubunkin's tail fin?

[Kristi Kelty]

Does anyone know what the beebee looking dot is at the base of the Shybunkin's tail fin?

 

[C-Note]

Is there a photo we can see of what you are describing?

 

[Mmathis]

Does anyone know what the beebee looking dot is at the base of the Shybunkin's tail fin?

The photo didn't show up in your post.