This acidity helps protect against harmful bacteria and infections. Over time, the acidic discharge can bleach darker fabrics, leaving lighter or orange-toned spots in underwear.
This process is usually harmless and can actually be a sign that the body’s natural protective system is functioning normally. Cotton underwear may show these marks more clearly than synthetic fabrics.
Sweat can also contribute to fading or yellowing. Areas with more moisture and friction are more likely to develop discoloration after repeated wear and washing.
