Possibly running: If he does not recall cutting his foot on a sharp object, it is likely to be related to running. The foot sole of the foot can become quite calloused, and then will crack or fissure with excess movement. Keeping the skin of the foot lubricated and removing large calluses is important for prevention. New Skin is a liquid bandage that can help with healing. If look infected or bleed, see doctor.
Answered 10/16/2019
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