Many women are surprised to find bleach-like patches on their underwear, but the cause is completely natural and harmless. These lighter areas aren’t from detergent or hygiene issues—they’re the result of the vagina’s healthy, slightly acidic pH, which typically ranges from about 3.8 to 4.5. That acidity helps protect against infections, but when vaginal discharge sits against fabric for long periods, it can break down dyes, especially in darker underwear, creating a bleached look. Far from being a problem, it’s actually a sign that the vagina’s self-cleaning system is working as it should, and there’s no need for concern or special treatment.
