The Real Reason Behind the “Bleach” Patch on Your Underwear

The internet has given us answers to questions we didn’t even know we had. From debunking old myths to uncovering everyday life hacks, it’s become a limitless source of shared knowledge.

One common question that’s circulated online recently is this: Why do underwear sometimes develop patches that look like bleach stains?

The Surprising Answer
Many have assumed it’s down to washing machines, detergents, or poor fabric quality. But the real cause has nothing to do with laundry.

Instead, experts explain that those light patches are actually the result of the vagina’s natural pH levels — and far from being a problem, they’re actually a sign of good health.

Why It Happens

The vagina is slightly acidic, with a pH usually between 3.8 and 5.0 (compared to a neutral pH of 7). This acidity:

Helps protect against harmful bacteria.

Is maintained by natural secretions and healthy vaginal flora.

Can sometimes lighten or “bleach” the fabric of underwear over time.

As one viral social media post put it:

“It’s completely normal to see lighter patches in underwear due to the vagina’s acidic nature. A healthy vagina can literally bleach fabric.”

What Doctors Say
Dr. Vanessa MacKay of the Royal College of Obstetricians and Gynaecologists explains:

“The vagina has a self-cleaning mechanism through natural secretions. It contains beneficial bacteria that serve to protect it.”

She adds that clear or white discharge is normal, and that disrupting this balance — for example, by overwashing or using harsh products — can actually lead to infections.

Bottom Line
If you’ve ever noticed these so-called “bleach patches” on your underwear, don’t worry — they’re not a sign of poor hygiene, but rather a healthy, functioning body doing exactly what it’s supposed to.

✨ Did you know this? Share this article to spread the word and help break unnecessary myths about women’s health.

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