A very common skin condition that affects many skateboarders, griptape thumb is the wear and tear of the skin on the thumb caused by new griptape (an adhesive-backed, sandpaper-like sheet applied to the top of a skateboard which gives the rider grip).
To prevent griptape thumb, wrap your thumb in medical tape before a skate session.
by StickyMikeD November 24, 2009
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