If you’ve ever taken your underwear out of the wash and noticed a light-colored or slightly bleached-looking patch in the crotch area, you’re not alone—and no, your detergent isn’t to blame. That odd discoloration is actually caused by your body, not your laundry routine.

The Real Reason Behind the Patch

That bleach-like stain is typically the result of vaginal discharge, which is completely normal and healthy. Vaginal discharge helps the body naturally clean itself and maintain a proper pH balance. For most women, this discharge is slightly acidic, with a pH between 3.8 and 4.5. That level of acidity can cause a lightening or fading of fabric over time—especially in dark-colored underwear.

Why This Is Actually a Good Sign

As strange as it might seem, the presence of this “bleached” patch is actually a good indicator that your vagina is doing its job. A balanced vaginal pH level helps prevent infections and keeps harmful bacteria away. So, if your underwear shows signs of mild fading in the crotch area, it’s usually a sign of a healthy, self-cleaning reproductive system.