This Bible contradiction is from the Skeptic's Annotated Bible.
2 Kings 5:27 View context
The leprosy therefore of Naaman shall cleave unto thee, and unto thy seed for ever. And he went out from his presence a leper [as white] as snow.
2 Kings 8:4 View context
And the king talked with Gehazi the servant of the man of God, saying, Tell me, I pray thee, all the great things that Elisha hath done.