It's definitely not Ick as Ick is only about the size of a grain of salt. To be honest, the fish does not appear to be a healthy fish based on it's body shape, fin appearance and shape.

Goldfish, even healthy ones, are prone to tumors and it appears that this fish is developing one on his head. Sadly, there is nothing you can do to treat tumors past making sure the fish has good clean water and a healthy diet. The good news is that tumors are not a death sentence unless they impede the fish's ability to feed. The bad news is that they can get unsightly.
Hope this helps.