Strange lumps on comets

I have an 82 gal tank dedicated to a variety of goldfish and plants.
There's some fancy goldfish in there (Orange cap Oranda, black Telescope,
celestial, Bubble eye - all about 4"-5" from nose to tip of tail) and some
plain old comet feeders that I've had for just over a year and a half and
are now anywhere from about 2" up to about 4".
Today, I added a few more small fancy goldfish. I know one is a red cap, a
ranchu and a lionhead, I believe, and one more I can't remember off hand,
and after floating the fish for a little while, I went to add them to the
tank, and noticed the biggest of the feeder comets has strange lumps on him.
I just noticed them right now, and he seems to be swimming around just fine,
as they all have always. There's a lump towards his head on its left side,
and on its right side, there almost looks like a hole or something. It's so
hard to explain... It's like a little bubble with some white stuff on it
that pokes out.
Does anyone have an idea of what I'm talking about? It just doesn't seem
normal, and also doesn't seem like something that has happened over night.
I think it is something that has happened over the last little while that I
just noticed now when I actually sat there looking at the fish for a
while...
I know it's just a feeder fish (that I think I paid about 11¢CAN for), but
I've had these feeders for so long, they're so big now and I don't want him
to die if there's something that can be done.
Thanks for any suggestions!

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