The Two and a Half Men regular, 48, made his big reveal during an appearance on U.S. chat show Conan on Monday night (11Nov13), confessing his hair is "gone now".
He told host Conan O'Brien, "This is an elaborate illusion. This is the work of several talented professionals making the most of, like, four hairs. It's amazing, actually, what they can do. I'm not wearing a piece - or anything like that - but it's a long involved process that starts with stuff like shoe polish. Basically, they coat the top.
"They basically just paint - they get a roller type thing... and then they literally sprinkle powder in from a salt shaker. So this is, like I said, four or five hairs."
And Cryer admits he has to be careful when it's raining.
He adds, "It flattens out and you can get the nice little rivulets going down."
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