The first sign of penile cancer is almost always a visible change in the skin of the penis, most often on the foreskin or the head (glans). These changes are typically painless, which is partly why people delay getting checked for an average of six months or longer after first noticing something unusual. Knowing exactly what to look for can help you act sooner, and early detection makes a significant difference: the five-year survival rate for localized penile cancer is 79%, compared to just 10% when the cancer has spread to distant parts of the body.
Skin Changes to Watch For
Penile cancer doesn’t usually announce itself with pain. Instead, it shows up as changes you can see or feel on the skin. The most common signs include:
- A lump or sore that won’t heal, which may or may not bleed
- Skin thickening in one area, or a patch where the skin color changes
- A reddish, velvety rash under the foreskin
- Flat, bluish-brown growths
- Small, crusty bumps
- Foul-smelling discharge or bleeding from under the foreskin
Most of these changes appear on the foreskin or the tip of the penis. They can look surprisingly subtle at first, resembling irritation or a minor skin problem. The key distinguishing feature is persistence. Infections and allergic reactions cause many of the same symptoms, but they typically respond to treatment within a couple of weeks. A lesion or skin change that doesn’t improve, or that slowly grows, warrants a closer look.
How It Differs From Common Infections
Balanitis, yeast infections, and other common penile conditions can cause redness, swelling, and irritation that overlap with early cancer symptoms. The difference often comes down to a few practical details. Infections tend to cause itching or burning and respond to antifungal or antibiotic treatment. They also usually affect a broader area rather than forming a distinct, well-defined lesion.
Cancerous changes, by contrast, are more likely to be painless, localized to one spot, and persistent over weeks. A sore that crusts over, partially heals, then returns is more concerning than generalized redness. Flat growths with an unusual color, or a velvety red patch that stays in one place, are patterns that infections rarely produce. If you’ve treated what you thought was an infection and the area hasn’t cleared, that’s a strong reason to follow up.
Pre-Cancerous Conditions
Penile cancer often develops from pre-cancerous skin changes collectively known as penile intraepithelial neoplasia, or PeIN. These are abnormal cells confined to the surface layer of skin that haven’t yet invaded deeper tissue. About 2% of these lesions progress to invasive cancer without treatment, though certain types carry higher risk. Historically, two patterns were described under different names. One appears as scaly, reddish patches on the shaft. The other shows up as a well-defined, red, velvety area on the glans or foreskin. Up to 10% of men with either pattern eventually develop invasive cancer if left untreated.
These pre-cancerous changes are treatable and represent a window of opportunity. Catching the disease at this stage means simpler treatment and a much better outcome.
Swollen Groin Lymph Nodes
The lymph nodes in your groin are the first place penile cancer typically spreads. If you notice hard or swollen lumps in the crease where your leg meets your torso, especially on the same side as a penile lesion, this could signal that cancer cells have reached the lymph nodes. Groin lymph nodes can also swell from infections, so swelling alone isn’t proof of cancer, but the combination of a persistent penile lesion and enlarged groin nodes is a pattern that needs prompt evaluation.
Lymph node involvement dramatically changes the outlook. The five-year survival rate drops from 79% for cancer that remains on the penis to 57% once it reaches nearby lymph nodes. Even in cases where a doctor finds no obvious signs of lymph node involvement on physical exam, there’s a 10 to 20% chance of microscopic spread that isn’t detectable by touch alone, which is why imaging and sometimes biopsy of the lymph nodes are part of the workup.
What Increases Your Risk
Several factors make penile cancer more likely, and understanding them can help you gauge your own level of concern.
HPV (human papillomavirus) is found in roughly 48% of penile cancer cases, with the high-risk strains 16 and 18 present in about 37% of samples. This is the same virus linked to cervical cancer, and HPV vaccination reduces risk.
Phimosis, a condition where the foreskin can’t be pulled back, is present in 25 to 75% of penile cancer patients. It creates a warm, moist environment where irritants and infections can persist, and it makes it harder to spot early skin changes. The increased risk is substantial: men with phimosis are roughly 5 to 37 times more likely to develop penile cancer depending on the study.
Smoking is an independent risk factor. Heavy smokers face roughly double the risk compared to nonsmokers, and a dose-response relationship exists, meaning the more you smoke, the higher the risk. Chewing tobacco and snuff use carry similar associations.
How Penile Cancer Is Diagnosed
Diagnosis starts with a physical exam. A doctor will visually inspect the lesion, feel it to assess depth, and check the lymph nodes in your groin. If the appearance raises concern, the next step is a biopsy, where a small sample of tissue is removed and examined under a microscope. This is the only way to confirm whether cancer cells are present.
If the biopsy is positive, imaging helps determine how far the cancer has spread. MRI is the most accurate tool for evaluating the primary tumor, particularly for assessing whether cancer has grown into deeper structures of the penis. This matters because it helps determine whether organ-sparing treatment is possible. CT scans play a more limited role in evaluating the tumor itself but are the go-to tool for checking whether cancer has spread to distant organs. In some cases, a PET scan may be used to look for spread to lymph nodes or other sites.
Survival Rates by Stage
Based on data from men diagnosed between 2015 and 2021, the five-year relative survival rates for penile cancer are:
- Localized (cancer confined to the penis): 79%
- Regional (spread to nearby lymph nodes): 57%
- Distant (spread to other organs): 10%
The overall five-year survival rate across all stages is 65%. These numbers reinforce a clear pattern: the earlier the cancer is found, the better the outcome. Because penile cancer lesions are often painless and may resemble benign conditions, the tendency to wait and see works against you. Any unexplained skin change on the penis that lasts more than a few weeks, particularly one that matches the descriptions above, is worth having examined. A biopsy is a minor procedure, and ruling out cancer is far better than giving it time to advance.