Many women notice faint, bleach-like stains on their underwear and wonder why. One user asked, “Why do my underwear look like they’ve been bleached?” sparking a wave of responses. The answer: it’s completely normal—and even healthy.

These marks are caused by natural vaginal secretions, which are slightly acidic (pH 3.8–4.5) due to good bacteria like lactobacilli. This acidity helps maintain a healthy balance and prevents harmful bacteria. As a result, it can mildly bleach fabric. “It’s not magic—it’s just science,” the article explains.

Dr. Vanessa MacKay from the Royal College of Obstetricians and Gynaecologists confirms, if discharge can “bleach” fabric, it signals a healthy vagina—not poor hygiene. Using harsh products or overwashing can actually disrupt this balance.

Discharge can vary in texture and color based on hormonal changes. As long as it’s odorless and not uncomfortable, it’s normal. For comfort and durability, wear breathable cotton and avoid harsh soaps.

In short, don’t stress about the stains. They’re a sign your body’s doing what it’s supposed to. “Trust your body—it knows what it’s doing.”