This Bible contradiction is from the Skeptic's Annotated Bible.
Exodus 4:11 View context
Blind and deaf people were purposely made by God.
Who maketh the dumb, or deaf, or the seeing, or the blind? have not I the LORD?
John 9:1-3 View context
Some were made blind so that Jesus could show off by healing them.
And as Jesus passed by, he saw a man which was blind from his birth. And his disciples asked him, saying, Master, who did sin, this man, or his parents, that he was born blind? Jesus answered, Neither hath this man sinned, nor his parents: but that the works of God should be made manifest in him.
Mark 9:17, 25 View context
People are made blind and deaf by evil spirits.
And one of the multitude answered and said, Master, I have brought unto thee my son, which hath a dumb spirit. Jesus ... rebuked the foul spirit, saying unto him, Thou dumb and deaf spirit, I charge thee, come out of him, and enter no more into him.