The internet has debunked countless myths, including a common question among women: why does underwear sometimes look bleach-stained?

Many speculated it was due to washing machines, but experts say otherwise. Dr. Vanessa MacKay explains that the vagina’s natural self-cleaning process produces secretions with a slightly acidic pH (3.8–5.0), which can cause fabric discoloration.

This is completely normal and healthy, though disrupting this balance can lead to infections.