Anyone ever seen this before? I caught this fish today and he had moss growing on both sides of his head?

It looks like there was some sort of disease eating away at the skin, and the moss started growing over the raw skin. It was on both sides. I only saw the small patch on the right at first and went to pull it off before I let him go. I noticed it was attached and then noticed the other side, which was way worse! I just left it alone cause he seemed healthy. :-)

Just wondering if anyone else has seen this or knows what it is?

http://www.calfishing.com/dc/user_files/2358.jpg


http://www.calfishing.com/dc/user_files/2359.jpg