Corydora with unusual raised white spot preceding dorsal fin. Fish has been in a community tank for more than 4 months. Community consists of Glowlight Tetra's, Shrimp, Ottos, and two species of Corys. I never had a reason to look in detail at this particular fish until I noticed the white area about two weeks ago. I have completed a course of ParaCleanse with no change in the fish, or the white abnormality.
I have attached a photo of the fish in question, and a photo of a healthy fish in the same tank.
Any thoughts or ideas are welcome.