Under normal circumstances, the foot patch will become wet and black when in general use, especially when the foot powder reacts with sweat on the soles of the feet, which is a physical phenomenon.

1, feet are not wet after use. It may be that it is not tightly attached to the skin, and it is not firmly attached.

2, there is no sweat on the sole of the foot, it can't react with the foot powder package and can't be absorbed.

3. It is suggested that before using the foot patch, the feet should be scalded with warm water to promote capillary dilation, and the ingredients of the foot patch are easier to absorb.