Oprah: "You didn't just wake up one morning and you were blue?"
Blue man: "It was gradual, two to three months I actually did this."
Doctor Oz examines how Paul Karason's skin turned blue.
Karason drinks a health tonic, called colloidal silver, that's been linked to the bluish-purple discoloration.
But he doesn't think drinking it changed the color of his skin, he thinks it's because he rubbed it on his face to treat a skin problem.
See the blue man Tuesday at 4 pm on ABC30.