Have you ever noticed a faded, bleach-like patch in the crotch area of your dark-colored underwear? It might look alarming at first, almost like your laundry detergent betrayed you. But here’s the truth: this phenomenon is actually very common — and in many cases, it’s a sign of a healthy body doing exactly what it’s supposed to do.
Let’s unpack the surprising science and the subtle lifestyle factors that contribute to these mysterious marks.