A short while ago while feeding my fish, I noticed what appears to be a whitish/greenish coloured "spot" on my large pleco's nose area. I'm pretty sure it is new, but I don't often get to take a good look at him as he is usually hiding (except at feeding time or when the aquarium lights are off).
I haven't owned him long, just a few months or so, but I've grown very attached to him already and I would absolutely hate to lose him.
![Image](http://i869.photobucket.com/albums/ab251/Maximuffin/006.jpg)
Am I just overreacting? As far as I can tell, the spot shouldn't be there... and it almost looks like cotton-mouth or some kind of fungus. I'm fairly new to owning plecos, though, so I would appreciate any help or ideas anyone may have for me. His behaviour has not been affected by it at all, from what I've seen so far.
Thank you.