There are two reasons, one is beriberi caused by fungal infection, and the back of sweat contains urea and lactic acid, which will form low calcium lactate when reacting. This is an unpleasant odor substance, which smells like cheese that has been placed at room temperature for more than half a year. This is easy to treat. Just spray some athlete's foot water to inhibit fungi, or pour some foot powder (a bottle cap) when washing your feet.

The second reason is the uncoordinated circulation in the body, which leads to the inability of sweat to be metabolized and excreted. So consider the body, eat more foods containing dietary fiber and moistening intestines, exercise regularly, and pay attention to physical maintenance (that is, health preservation).