The effect of spa health care on the skin: cold water bath will make the skin pale, the elastic fibers of the skin shrink, make the skin surface bulge [goose bumps], then turn red, and the tactile sensitive reflex activity disappears. A hot bath with high temperature will produce a similar reaction, but the skin will not be so pale and the degree of goose bumps will not be as strong as that of a cold bath. At the beginning of warm water bath, the skin surface becomes pale, but the skin will gradually turn red. High temperature hot water bath will reduce the tactile sensitivity, but moderate warm water bath will improve the tactile sensitivity of skin.