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Another common cause of burning feet is athlete's foot fungus. Some less common causes include alcoholism, chronic kidney failure, peripheral arterial disease, tarsal tunnel syndrome, Morton's neuroma, vitamin deficiency, HIV or AIDS, complex regional pain syndrome, and gastric bypass surgery.
4. 1  Other Possible Causes. 2  Dark spots on bottom of foot can be caused by other problems as well. 3  Diabetic dermopathy, often associated with high blood sugar levels, creates a problem with blood vessels in the skin. This can lead to oval and circular brown spots; these donât produce any pain.