Men get yeast infections when a fungus called Candida, which normally lives on the skin in small amounts, multiplies out of control. This overgrowth usually happens on the head of the penis and under the foreskin, where warmth and moisture create ideal conditions. Several factors can tip the balance, from antibiotics to uncontrolled blood sugar to sex with an infected partner.
How Candida Overgrows
Candida species live on your skin all the time without causing problems. Your immune system and the bacteria that share your skin keep the fungus in check. A yeast infection develops when something disrupts that balance, allowing Candida to multiply faster than your body can control it. The warm, moist environment under the foreskin or in skin folds of the groin is especially hospitable to fungal growth.
The Most Common Causes
Antibiotics
Antibiotics are one of the most common triggers. They kill off bacteria throughout your body, including the helpful bacteria that compete with Candida for space and resources. With that competition gone, yeast can overgrow. The risk increases with longer courses of antibiotics, though even a short round can sometimes be enough to trigger an infection.
High Blood Sugar
Yeast feeds on sugar. If you have diabetes or consistently elevated blood sugar, the extra glucose in your skin and bodily fluids creates a rich food source for Candida. High blood sugar also weakens your immune response, making it harder for your body to keep the fungus under control. Men with poorly managed diabetes are significantly more likely to deal with recurring yeast infections.
Sexual Transmission
Yeast infections can pass between sexual partners, though it’s less common than many people assume. Transmission from a partner with a vaginal yeast infection to a male partner during sex does happen, but it’s actually more common in the other direction. The fungus transfers through direct genital contact. If your partner has an active yeast infection, using a condom or waiting until they’ve finished treatment reduces your risk.
A Weakened Immune System
Any condition or medication that suppresses your immune system raises the odds. This includes HIV, chemotherapy, long-term steroid use, and chronic illnesses that compromise immune function. When your body’s defenses are down, Candida takes advantage.
Moisture and Tight Clothing
Yeast thrives in moist environments. Wearing tight, synthetic underwear or workout clothes that trap sweat against the skin creates exactly the conditions Candida needs to multiply. Staying in wet swimwear or sweaty gym clothes for extended periods is a common setup for an infection.
Circumcision Status Matters
Uncircumcised men face a higher risk. The foreskin creates a warm, enclosed space where moisture collects, giving yeast an ideal place to grow. Globally, about 3% of uncircumcised men are affected by balanitis (inflammation of the head of the penis), with yeast being one of the leading causes. One study in Kenya found that Candida rates were 40% lower in women whose male partners were circumcised, suggesting circumcision reduces fungal colonization on the penis itself. If you’re uncircumcised, daily cleaning under the foreskin and thorough drying are important for prevention.
What It Looks and Feels Like
Male yeast infections typically show up as patchy redness and swelling on the head of the penis or under the foreskin. You might notice a thick, white discharge that looks like cottage cheese and has an unpleasant smell. Burning, itching, and irritation are common, especially during urination or sex.
In some cases, small shiny sores or blisters develop on the penis. The foreskin can become tight and difficult to pull back. As the infection progresses or heals, the affected skin often becomes flaky, crusty, or starts peeling because the infection damages the outer skin layer.
How It’s Diagnosed
A doctor can often identify a yeast infection by its appearance alone. When confirmation is needed, they’ll take a swab of the affected area. The sample is treated with a potassium hydroxide solution, which dissolves skin cells but leaves fungal cells intact so they can be seen under a microscope. This simple test confirms whether Candida is the cause or if something else, like a bacterial infection, is responsible for your symptoms.
Treatment and Recovery
Most male yeast infections clear up with an over-the-counter antifungal cream applied directly to the affected area twice daily. You’ll typically use the cream until symptoms resolve, which takes about one to two weeks for most men. If the infection is severe or keeps coming back, a doctor may prescribe an oral antifungal pill instead.
During treatment, keep the area clean and dry, avoid sex until the infection clears, and switch to loose cotton underwear. If you have a regular partner, they should be checked too, since passing the infection back and forth can make it difficult to fully resolve.
Reducing Your Risk
The CDC recommends three straightforward steps for prevention: wear cotton underwear, choose breathable clothing that isn’t too tight, and keep the groin area clean and dry. Beyond that, change out of wet or sweaty clothes promptly, dry thoroughly after showering (especially under the foreskin), and avoid scented soaps or body washes on your genitals, which can disrupt the skin’s natural balance.
If you have diabetes, keeping your blood sugar well managed is one of the most effective things you can do. And if you’re prescribed antibiotics, be aware that a yeast infection is a possible side effect. Finishing the full antibiotic course is still important, but knowing the risk means you can watch for early symptoms and treat them quickly.