Sulfur soap is fine for washing underwear. The ingredients of sulfur soap are sodium fatty acid, sulfur, coloring, fragrance and other ingredients. Sulfur in sulfur soap is good to play a role in inhibiting bacteria, because the human body’s secretions will be left on the underwear, and sulfur can not only play the role of decontamination, but also can play a certain role in sterilization. But the use of sulfur soap to clean underwear, should be more than a few rinsing. Failure to wash it well can bring a burning sensation to the private parts. Sulfur soap should also pay attention to the method, after washing underwear, it is best to rinse the pants several times. It can eliminate the residual substances on the underwear. Avoid some irritation to the skin when wearing. When patients use sulfur soap to wash underwear and cause local discomfort, they should stop using it in time.