Smegma is a whitish, crumbly substance that collects in the skin folds of the genitals. It’s often described as looking like crumbly cheese, and its color typically ranges from white to pale yellow. It’s not an infection. Smegma is made up of shed skin cells, natural oils, and proteins that your body produces normally.
Appearance, Texture, and Smell
Fresh smegma tends to be soft, moist, and off-white. As it accumulates over days without washing, it becomes thicker, drier, and more crumbly. The color can shift from white to yellowish as dead skin cells and oils break down together. It has a slimy, somewhat waxy texture when fresh and a more paste-like or chalky consistency when it’s been sitting for a while.
Smegma also has a noticeable smell. It carries a characteristic musty or sour odor that intensifies the longer it builds up. The smell comes from the natural breakdown of skin cells and oils in a warm, moist environment, not from bacteria or fungus. Smegma itself is neither bacterial nor fungal, though heavy buildup can create conditions where bacteria thrive.
Where It Collects
In uncircumcised males, smegma accumulates under the foreskin, particularly along the groove where the head of the penis meets the inner foreskin. You’ll typically see it as small whitish clumps or a thin film when the foreskin is pulled back. Circumcised males can still develop some smegma, though it’s less common because there’s no skin fold to trap it.
In females, smegma gathers around the clitoral hood and between the inner labial folds. The appearance is the same: whitish, soft buildup tucked into the creases of the skin. Because these areas stay warm and moist, smegma can accumulate quickly without regular cleaning.
Smegma in Infants and Children
In young uncircumcised boys, smegma sometimes forms small, firm lumps called “smegma pearls” or keratin pearls. These appear as yellowish-white nodules visible under the foreskin, usually near the base of the glans. They can look alarming, but they’re benign. They form because the foreskin in young children is often not yet fully retractable, which allows shed skin cells to collect and compact into a visible bump. The urethra isn’t affected, and smegma pearls typically resolve on their own as the foreskin naturally loosens with age. It’s important not to forcefully retract a child’s foreskin to remove them.
How to Tell It Apart From an Infection
Smegma on its own doesn’t cause pain, burning, or intense itching. If you’re seeing a white, cheesy substance but also experiencing redness, swelling, or discomfort, that’s a sign the buildup may have triggered inflammation. In males, this inflammation of the head of the penis is called balanitis, and its symptoms go beyond what smegma alone causes:
- Pain or irritation on the head of the penis
- Itching under the foreskin
- Swelling and skin discoloration (red, pink, purple, or gray)
- Burning during urination
- Shiny, hardened patches of skin
Left untreated, balanitis can cause scarring that tightens the foreskin to the point where it can’t be pulled back at all. That’s a separate condition called phimosis, and it sometimes requires medical treatment.
A yeast infection can also look similar to smegma, with white, clumpy discharge in the genital area. The key difference is that yeast infections cause significant itching, redness, and sometimes a burning sensation, while plain smegma doesn’t cause symptoms beyond its appearance and smell. Smegma is not a fungal infection, though excessive buildup in a moist environment can sometimes contribute to one developing.
Genital warts and herpes look quite different from smegma. Warts appear as raised, flesh-colored bumps, while herpes shows up as blisters or open sores. Neither resembles the soft, crumbly, cheese-like texture of smegma.
How to Clean It Safely
Smegma washes away easily with warm water. For uncircumcised males, gently retract the foreskin, rinse the area underneath with warm water, and pat dry before replacing the foreskin. For females, gently separate the labial folds and rinse around the clitoral hood with warm water.
Mild, unscented soap is fine if you prefer it, but it’s not necessary, and heavily fragranced soaps or body washes can irritate the delicate genital skin and actually make things worse. The goal is regular, gentle cleaning rather than aggressive scrubbing. Doing this daily or every other day during bathing is enough to prevent buildup. If smegma has hardened and won’t come off easily, don’t force it. Soaking in a warm bath for a few minutes will soften it enough to rinse away gently.