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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.
A doctor can remove problematic spots on the bottom of the feet surgically or through cryotherapy, a process in which the spot is frozen off with liquid nitrogen. He can also use canthardin to cause the spots to blister and pull away from the skin. Spots caused by syphilis must be treated with an injection of penicillin, which ceases the disease.