When panties cannot get sunlight, the disinfection conditions are not good and they are prone to mycosis vaginalis. If a woman has recurrent mycosis vaginalis and her panties cannot get sun exposure, she can choose to use boiling water to sterilize them. Using a separate tool to wash the panties and then put them in boiling water to disinfect them, and using boiling water to disinfect them instead of sun exposure can also be a good way to prevent inflammation. If sun exposure or boiling water disinfection is not available, you can also choose to use ultraviolet light for disinfection. After washing and drying the underwear, you can put them under ultraviolet light to disinfect them. Putting the underwear under ultraviolet light for half an hour or so can have a good sterilizing effect. The penetration of ultraviolet light is very weak. When using ultraviolet light to disinfect, it is important to disinfect both the reverse side and the front side, not one side alone.