What are the risks of using sulfur soap to wash underwear long-term?
Nov 11, 2025
Source: Cainiu Health
Dr. Liu Wenmin
Introduction
Long-term use of sulfur soap to wash underwear may generally lead to damage to the fabric, disruption of the skin's protective barrier in the genital area, dryness and itching, reduced comfort of the underwear, and irritation from residual components. The chemical ingredients in sulfur soap are somewhat corrosive; prolonged use can degrade the fiber structure of underwear, causing cotton underwear to become stiff and synthetic fabrics to deform, thus shortening the lifespan of the underwear.
Long-term use of sulfur soap to wash underwear may generally lead to damage to the fabric, disruption of the intimate skin barrier, dryness and itching, reduced comfort, and irritation from residual components. Specific analyses are as follows:
1. Fabric Damage: The chemical ingredients in sulfur soap are somewhat corrosive. Prolonged use can destroy the fiber structure of underwear, causing cotton underwear to become stiff and synthetic fabrics to deform. This shortens the lifespan of the underwear and may compromise its breathability.
2. Disruption of Intimate Skin Barrier: The skin in the genital area is delicate. Sulfur soap has strong cleansing power and is alkaline, so long-term use can excessively remove natural oils from the skin surface, impairing the skin’s protective barrier and reducing its resistance to external irritants.
3. Skin Dryness and Itching: The alkaline components and oil-stripping effect of sulfur soap can deplete moisture and natural oils from the intimate skin. Continued use may result in dryness and subsequent itching, particularly noticeable during dry seasons or among individuals with sensitive skin.
4. Reduced Underwear Comfort: Affected by the chemicals in sulfur soap, underwear fabric may become stiffer and lose elasticity. This reduces softness and fit when worn, increasing skin friction and decreasing comfort during daily activities.
5. Residual Components Irritating the Genital Area: If not thoroughly rinsed, sulfur soap residues may remain on the underwear. When worn, these residues continuously contact the sensitive genital skin, potentially causing local irritation such as redness and a burning sensation—effects that are more pronounced in sensitive individuals.
It is recommended to use a mild, specialized laundry detergent for washing underwear, avoiding strongly alkaline or irritating cleaning products. After washing, ensure thorough rinsing to prevent residue buildup.
