Make the Diagnosis: A Pool of Problems?

(MedPage Today) — A 21-year-old student noticed a white scaly plaque developing on the bottoms of both feet. He is an avid swimmer, competing for his college team during the school year and also hitting his local pool over the summer. On one foot, he was starting to see some deep skin fissures develop. Both feet are very itchy.

Can you diagnose the patient?
Source: Dermatology