Penile Discoloration: Causes, Treatment, When To Seek Help

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HealthlineSubscribeSkin CareWhat Causes Penile Discoloration?

Medically reviewed by Aaron R. Block, MD MPH CPH DABFM MSCP — Written by James Roland — Updated on June 4, 2025

Bruise
Melanosis
Contact dermatitis
Lichen sclerosus
Lichen planus
Vitiligo
Syphilis
Cancer
Seeking help
Takeaway

Causes of penis discoloration are often harmless and include sexual arousal, bruising, and skin conditions. More serious causes include lichen sclerosis and penile cancer, which is rare.

During sexual arousal, the penis can take on a reddish, almost purple color because of the increased blood flow to its blood vessels and glands. But there are other potentially serious reasons why your penis might turn a different color.

The causes of penile discoloration can range from a zipper-inflicted bruise to penile cancer, a rare condition that represents less than 1% of cancers in people with a penis. In some cases, a change in penis color is a sign of a sexually transmitted infection (STI) or a noncontagious, harmless skin condition.

Penile discoloration is almost always a cause for a medical evaluation. It may end up being temporary and relatively benign, but you shouldn’t make that diagnosis on your own.

If the change in color is due to an underlying cause that’s medically serious, getting a diagnosis and starting treatment earlier is always a smart approach.

Read on to learn about the possible causes and treatment options for a discoloration of the penis.

Bruise or injury

A bruise anywhere on the body is the result of tiny blood vessels rupturing just below the surface of the skin. A bruise can form on the penis from a zipper accident, vigorous intercourse or masturbation, or if pinched or struck.

A mild bruise will turn a darker color as it heals and then will fade away.

Treatment

You can apply a warm compress to your penis to help disperse blood and heal a bruise faster. No medical attention may be necessary. However, a doctor should evaluate a more severe bruise. The same is true if a small bruise fails to heal on its own.

To avoid an injury to your penis, be sure to wear protective gear when playing sports and use care when zipping up your pants.

»Learn more:How to Identify, Treat, and Prevent Friction Burn on Your Penis

Penile melanosis

Penile melanosis is a harmless skin condition that causes small patches of darkened skin to appear on the shaft or head of the penis, also called the glans. It occurs when melanin forms concentrated deposits on the surface of the skin.

Penile melanosis isn’t an STI and isn’t contagious.

It’s not well understood why some men develop this skin condition, though there’s some evidence that psoriasis treatment, which includes the medication psoralen and ultraviolet light, may raise the risk of penile melanosis.

Treatment

Treatment usually isn’t necessary, though surgical removal of the patches may be possible in some cases. The procedure may leave noticeable scars, however.

Contact dermatitis

Contact dermatitis is a skin reaction to contact with an irritant. Certain soaps or detergents can trigger a reaction anywhere on the body.

When contact dermatitis affects the penis, it’s often caused by a latex condom. You may not know you have a latex allergy until you experience a reaction. The skin can turn red and itchy. A serious reaction can also cause a break in the skin and the release of serum.

Other possible causes for contact dermatitis are allergies to soaps or detergents.

Treatment

You can treat a mild case of contact dermatitis with an over-the-counter corticosteroid cream. If there’s a break in the skin, see your doctor to help prevent an infection from developing. Nonlatex condoms are available if you have a latex allergy.

Lichen sclerosus

White patches that form on the penis could be a sign of lichen sclerosus. It’s a skin condition that’s more common in those who aren’t circumcised.

In addition to white spots that grow larger as the disease progresses, the skin of the penis can also become itchy and more fragile. Other symptoms include painful erections and decreased urine flow.

Lichen sclerosus is a lifelong condition that can go through periods of remission and flare-ups.

It’s not always clear why some people develop it. A family history of the condition may increase your risk. It may also be caused by an autoimmune disorder, which means the body’s immune system mistakenly attacks healthy cells.

If you have lichen sclerosus, you may be at a higher risk for other autoimmune disorders, such as thyroid disease or vitiligo.

Treatment

Treatment usually includes a strong steroid ointment applied directly to the affected skin. If only the foreskin is affected, doctors may recommend circumcision.

Lichen planus

Lichen planus can cause flat purple or white patches, often ring-shaped, on the tip of the penis. It can also cause itchy bumps, and, in some cases, painful ulcers can develop.

It’s important to see a doctor as soon as possible, as lichen planus can cause complications and increase the risk of some types of cancers.

Treatment

Some people can have lichen planus without symptoms. In those cases, medical treatment might not be necessary.

Topical steroid creams can reduce inflammation and symptoms like itching. In severe cases, a doctor may recommend stronger treatments or circumcision.

Vitiligo

Vitiligo occurs when skin cells stop producing melanin, the pigment that gives skin its color. Vitiligo typically affects areas such as the elbows and knees, but it can develop anywhere on the body, including the penis. It’s not painful or contagious. The texture of the skin should be unaffected.

Vitiligo may appear as a small whitish spot or cover a much larger area.

Treatment

Some steroid treatments and medications that work on the immune system may help restore color in small or mildly affected areas.

Syphilis

Syphilis is an STI that can ultimately affect the brain, heart, and other organs if not treated early and effectively.

The first sign is usually a white or red ulcer on the penis. It’s usually painless at first. If left untreated, however, an itchy rash can appear on much of the penis and the body. Other symptoms can include headache, fever, and fatigue.

Other STIs, such a genital warts, can cause bumps, growths, and other appearance changes. Getting tested regularly for STIs can help ensure early treatment if a test comes back positive. It’s also important to keep from spreading a disease. Practicing safe sex will also help improve your chances of avoiding STIs.

Treatment

Because syphilis is a bacterial infection, strong doses of antibiotics, such as penicillin, are necessary to treat the infection. However, you can be reinfected if you have unprotected sex with someone who has syphilis.

»More on this:Signs and Symptoms of Common STIs in Men

Penile cancer

Though cancer of the penis is rare, it’s important to know the signs so you can respond promptly.

One of the first symptoms of penile cancer, which occurs in an early stage of the disease, is a change in color. The shaft or the glans may be affected. The penis may turn reddish, or flat brown patches may form. The skin of the penis itself may also thicken, and the penis may feel sore.

Treatment

Treatment options include radiation therapy or surgery to remove small sections of cancer from the skin’s surface. The nature of the cancer and how much or little it has spread will help determine the best treatment approach.

When to seek help for penis discoloration

If you notice any penile discoloration that’s anything other than a mild bruise, of which you know the origin, you should see your doctor or a urologist. A urologist is a doctor who specializes in the health of the urinary tract and male reproductive organs.

Diagnosing your condition will usually involve a physical examination by a doctor and a review of your medical history and any other symptoms.

Depending on what your doctor suspects is the underlying cause of your penile discoloration, blood tests and other tests may be necessary.

A standard test includes a complete blood count. This test includes a check on levels of:

white blood cells
red blood cells
platelets

High white blood cell levels, for example, suggest the body is fighting an infection. A blood test can also be used to check for STDs, such as syphilis, HIV, herpes, and hepatitis. Other markers for cancer may also be detected in a blood test.

Suspicious growths or sores on the penis may be biopsied, meaning a healthcare professional carefully removes a small piece of tissue sends it to a lab for analysis with a microscope. This can sometimes reveal cancerous cells or signs of another disease.

Takeaway

Any change to the appearance of your penis, especially discoloration or the formation of unusual patches or growths, can be alarming. Don’t hesitate to seek medical attention. Early detection and treatment may help reduce your risk of other health complications that can come from an untreated condition.

If a harmless but permanent change in color occurs, consider talking with a therapist or other mental health professional to help you adjust to the change.

How we reviewed this article:

SourcesHistoryHealthline has strict sourcing guidelines and relies on peer-reviewed studies, academic research institutions, and medical journals and associations. We only use quality, credible sources to ensure content accuracy and integrity. You can learn more about how we ensure our content is accurate and current by reading our editorial policy.

Bunker C, et al. (2023). Lichen sclerosus in men.https://dermnetnz.org/topics/lichen-sclerosus-in-men
Key statistics for penile cancer. (2025).https://www.cancer.org/c
Lichen planus. (2024).https://www.bad.org.uk/pils/lichen-planus/
Shenot PJ, et al. (2023). Cutaneous penile lesions.https://www.msdmanuals.com/professional/genitourinary-disorders/penile-and-scrotal-disorders/cutaneous-penile-lesions

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Medically reviewed by Aaron R. Block, MD MPH CPH DABFM MSCP — Written by James Roland — Updated on June 4, 2025

Tag » Why Is My Penis Dark

Penile Discoloration: Causes, Treatment, When To Seek Help

Bruise or injury

Treatment

Penile melanosis

Treatment

Contact dermatitis

Treatment

Lichen sclerosus

Treatment

Lichen planus

Treatment

Vitiligo

Treatment

Syphilis

Treatment

Penile cancer

Treatment

When to seek help for penis discoloration

Takeaway

How we reviewed this article:

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