It could be...: Athlete's foot. The best otc medication (in my opinion) is lotrimin (clotrimazole) ultra. Dilute vinegar soaks are good as well. Dry the inside of your shoes by placing them up-side down over an air return vent at home overnight. If this doesn't make things better in a couple days, see a podiatrist.
Answered 12/26/2019
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Dermatitis: There are many causes, including fungal (athletes foot) infection, bacterial infection, contact dermatitis or allergic reaction. If it is more than a small area, spreading or getting worse then you need to see a dermatologist or podiatrist asap.
Answered 7/24/2016
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