Hyperkeratotic Plaques on Hands.

Previously published Photo Quizzes are now featured in a mobile app. Get more information at http:// www.aafp.org/afp/apps. A 10-year-old boy presented with a rash on both hands that had been present for at least several weeks. He had not worn any new gloves or other clothing. He had received a new video game at Christmas about five months prior and had played it for at least three to four hours every day since. On physical examination, he was not in distress. There were hyperkeratotic plaques on the lateral aspect of both of his index fingers (Figure 1). The lesions were symmetric, lichenified with erosions, and painful. The rest of the dermatologic examination was unremarkable.