A cheesy smell from the genitals is most often caused by a yeast infection or a buildup of natural secretions called smegma, neither of which is a sexually transmitted disease. No common STD produces a distinctly cheese-like odor. However, because several infections can cause unusual discharge and overlap in symptoms, it’s worth understanding what each one looks and smells like so you can tell them apart.
Yeast Infections: The Classic “Cottage Cheese” Culprit
When people describe a cheesy genital smell, they’re almost always dealing with a yeast infection (candidiasis). The hallmark is a thick, white discharge that looks like cottage cheese. In many cases, this discharge has little to no odor at all. When it does smell, it tends to be mild and slightly yeasty or bread-like, which some people interpret as cheesy.
Yeast infections are caused by an overgrowth of a fungus that normally lives on your skin in small amounts. They’re not considered an STD, though they can occasionally be passed between sexual partners. Things that trigger them include antibiotics, hormonal changes, a weakened immune system, tight or non-breathable clothing, and high blood sugar.
Other symptoms alongside the discharge include itching, burning during urination, redness, and swelling around the vulva or vaginal opening. Sex can be uncomfortable or painful during an active infection.
Yeast Infections in Men
Men get yeast infections too, particularly uncircumcised men. The symptoms show up around the head of the penis and under the foreskin: redness in patches, burning, itching, and a thick white discharge that resembles cottage cheese. Cleveland Clinic describes this discharge as potentially foul-smelling. The skin around the infection may become shiny, develop small blisters, or start peeling and flaking as it heals.
Smegma: Not an Infection at All
Smegma is a natural substance your body produces, made up of skin oils, dead skin cells, and sweat. When it builds up because the area isn’t washed regularly, it collects in skin folds around the genitals. In uncircumcised males, it gathers under the foreskin. In females, it accumulates around the clitoral hood and between the labia.
The buildup looks like crumbly cheese and smells like sour milk. That combination is what many people notice and then worry is an STD. Smegma itself isn’t bacteria or fungus, but it creates a warm, moist environment where bacteria thrive, and that bacterial growth is what produces the strong odor. Regular gentle washing with warm water is usually all it takes to prevent and resolve it.
What STDs Actually Smell Like
If you’re worried about an STD specifically, the odors they produce are different from a cheesy smell. Here’s how the most common ones present:
- Trichomoniasis causes a thin, frothy discharge that can be clear, white, yellowish, or greenish. The smell is distinctly fishy, not cheesy. It’s one of the few STDs with a noticeable odor.
- Chlamydia and gonorrhea can cause abnormal discharge that may have an unpleasant smell, but neither is typically described as cheese-like. Chlamydia discharge tends to be watery or slightly cloudy, while gonorrhea discharge is often yellow or green.
Bacterial vaginosis (BV) is another common cause of a fishy vaginal odor, particularly after sex. BV isn’t an STD either. It results from an imbalance in the normal bacteria of the vagina. The discharge is usually thin and grayish-white, quite different from the thick, clumpy texture of a yeast infection.
How to Tell What You’re Dealing With
The texture and color of the discharge are your biggest clues. Thick and white like cottage cheese points toward a yeast infection. Thin, watery, or frothy with a fishy smell suggests BV or trichomoniasis. Yellow or green discharge, especially with pelvic pain or painful urination, raises the possibility of gonorrhea or chlamydia.
One thing clinicians check is vaginal pH. A healthy vaginal pH sits around 4.0 to 4.5, though this varies by ethnicity. Yeast infections often keep the pH in a normal range, while BV and trichomoniasis push it higher. You can buy pH test strips at most pharmacies, but they can’t diagnose a specific condition on their own. They’re more useful for ruling things out.
If you’re unsure, a simple swab test at a clinic can identify exactly what’s causing the symptoms. This matters because the treatments are completely different: antifungals for yeast, antibiotics for bacterial infections and trichomoniasis. Using the wrong one won’t help and can make things worse.
What Happens if You Ignore It
A straightforward vaginal or penile yeast infection is uncomfortable but not dangerous. Most clear up within a week or two with over-the-counter antifungal treatment. Left untreated, symptoms typically persist or worsen, and the irritated skin becomes more vulnerable to secondary bacterial infections.
In rare cases involving people with severely compromised immune systems, yeast can enter the bloodstream and spread to organs like the kidneys, heart, eyes, and brain. This condition, called invasive candidiasis, is life-threatening. About 3 out of every 10 people who develop it die even with treatment. But this is a hospital-associated complication seen in critically ill patients, not something that happens from an ordinary genital yeast infection in an otherwise healthy person.
Smegma buildup, if consistently ignored, can lead to chronic irritation and inflammation. In uncircumcised males, prolonged buildup can contribute to the foreskin becoming difficult to retract, a condition called phimosis.