Please identify possible diseases

I have two common goldfish for more than 4 years. Please check the
following links and help me identify what's wrong with them:
1) One of them has nubs on tail: http://img373.imageshack.us/my.php?image=tailtb4.jpg
2) The same one has patches on both sides:
http://img229.imageshack.us/my.php?i...andspotmt0.jpg It's hard
to see it at the picture, but the skin color is different. Skin is
lighter outside but it's bloody red under the skin.
At the same picture, you can see red (bloody) spot at second goldfish.

They are happy and don't behave like sick. Six months ago, one of them
changed color (become white), and the second one also lost color near
the tail, and at the bottom.

Please help, any advise is welcome. Thank you!