Athlete's foot : Is the first thing i would suspect. The fungi eat skin, and can leave holes. Tinea pedis (to sound nerdy) is easily fixed with a topical anti fungal, such as tolnaftate. Go for the generics, they're cheaper. Have you changed what your feet see? Walking on hot sand barefoot? New flip flops? If there's anything new, try changing back. If these don't work, and the problem persists, see a doctor.
Answered 3/5/2019
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