Cell Thumb Replaces Writer’s Bump: Changing Times, Changing Callouses

Abstract

Common callouses are formed by the accumulation of keratinocytes in the stratum corneum in response to excess pressure or friction. We report 2 cases of unusual callous formation and an additional 25 more sequential cases that were due to excessive cell phone grip.

Keywords

• callous
• cell phone usage
• finger bump
• hand dermatitis