Peyronie's Disease: What Causes the Curve and What Treatments Actually Help

Finding a new bend in your erection, a hard patch under the skin of your penis, or pain that shows up only when you are erect is alarming, and it is also more common than most men realize. Peyronie's disease is the medical term for this: scar tissue that forms inside the penis and pulls it into a curve as it heals. It is a real, well-studied condition, not a sign that something is permanently wrong with you, and it has treatments with actual trial data behind them. Here is what the evidence says about why it happens, what you can expect if you do nothing, and which treatments are worth considering.

What Peyronie's disease actually is

The penis has a tough, fibrous sheath called the tunica albuginea that gives it structure during an erection. In Peyronie's disease, a patch of scar tissue, called a plaque, forms inside that sheath. Because scar tissue doesn't stretch the way healthy tissue does, the plaque pulls one side of the penis short during an erection, creating a curve, an indentation, or in some cases an hourglass-shaped narrowing. Some men also notice shortening or a loss of rigidity at the site of the plaque.

The condition tends to move through two phases. In the acute phase, which usually lasts somewhere between 6 and 18 months, the curve is actively changing and erections can be painful. In the chronic phase, the curve has stopped changing and pain has usually resolved, even though the curve itself remains. According to the American Urological Association's guideline on Peyronie's disease, this distinction matters a lot for treatment planning, since surgery is generally not considered until the disease has stabilized (https://doi.org/10.1016/j.juro.2015.05.098).

How common is it? Diagnosed cases are often cited around 0.5 to 1 percent of men, but a population-based survey found that when researchers asked men directly about symptoms rather than relying on diagnosis codes, the real number was likely higher, since many men never mention it to a clinician (https://doi.org/10.1371/journal.pone.0150157).

What causes the scar tissue to form

The leading explanation is repeated small injuries to the tunica albuginea, most often from bending or buckling during sex, that in most men heal normally without any lasting trace. In a subset of men, that healing process goes wrong: instead of resolving cleanly, the area lays down excess collagen and sometimes calcium, forming the fibrous plaque that causes curvature.

Why healing goes wrong in some men and not others isn't fully understood, but certain factors show up repeatedly in the research. One ultrasound-based study of men with Peyronie's disease found that over 80 percent had at least one risk factor associated with cardiovascular disease, such as high cholesterol, diabetes, or smoking (https://doi.org/10.1016/j.eururo.2007.07.013). Men with Dupuytren's contracture, a similar scarring condition in the hand, also appear to have higher rates of Peyronie's disease, which suggests some men may simply have a tissue-level tendency toward this kind of abnormal scarring.

How it's diagnosed

Peyronie's disease is usually diagnosed clinically, meaning a careful history and physical exam, rather than through a biopsy. Your clinician will typically ask about when the curve started, whether it has been changing, and whether erections are painful. Photos you take at home during a full erection are genuinely useful here, since curvature can be hard to assess and describe from memory alone. In some cases, a penile ultrasound is used to map the plaque's size and calcification and to check blood flow, which can also help predict whether the disease is likely to stabilize or continue changing.

Does it get better without treatment?

Sometimes, yes, at least in part. A study that followed men with Peyronie's disease who chose not to treat it for at least a year found that about two-thirds had a curve that stayed the same, about 12 percent improved, and about 21 percent got worse. Men who presented earlier after their curve started and who were younger were more likely to see improvement (https://doi.org/10.1111/bju.12346).

Ultrasound findings also seem to predict the course. In one study, men with a single, non-calcified area of scarring were far more likely to see their curve and plaque improve over a year than men with dense, heavily calcified plaques, where almost none improved (https://doi.org/10.1016/j.eururo.2007.07.013). This is part of why clinicians are often cautious about moving straight to surgery: a meaningful share of early, less calcified cases still have room to improve.

Treatments that actually have evidence behind them

Oral supplements and pills, including vitamin E and potassium para-aminobenzoate, have been studied for Peyronie's disease, but the AUA guideline found the evidence behind them too limited to recommend as primary treatment (https://doi.org/10.1016/j.juro.2015.05.098). If a product is marketed as a pill that reverses penile curvature, be skeptical of that claim specifically.

The best-supported nonsurgical option is an intralesional injection of collagenase clostridium histolyticum, an FDA-approved enzyme that breaks down the collagen in the plaque. A pooled analysis of two large phase 3, placebo-controlled trials involving over 800 men found significantly greater reduction in curvature with the medication than with placebo, and the benefit continued to build across each of up to four treatment cycles, meaning men who didn't respond fully after one or two cycles sometimes still improved with more (https://doi.org/10.1016/j.urology.2023.02.019). Longer-term follow-up of men treated in the original trials found the improvement in curvature and symptom scores was still present, and in some cases continued to improve slightly, up to five years later, without additional treatment (https://doi.org/10.1097/JU.0000000000000743).

For curvature that has stabilized and is severe enough to interfere with intercourse, surgical options, including plication procedures, grafting, or a penile implant, remain the most reliably effective approach, though they are more invasive and carry their own tradeoffs depending on how severe the curve is and whether erectile dysfunction is also present.

It's also worth treating this as more than a mechanical problem. In a clinic-based study of over 300 men with Peyronie's disease, erectile dysfunction was present in about 37.5 percent of cases, and depression was notably more common among men who had both conditions together than among those with Peyronie's disease alone (https://doi.org/10.2147/RRU.S109319). A good evaluation should look at erectile function and mood alongside the curve itself, not just the curve in isolation.

When to talk to a clinician

If you've noticed a new curve, a lump, or pain with erections, it's worth getting evaluated rather than waiting it out on your own, both because early evaluation gives you more treatment options and because it rules out other causes of penile pain or deformity. We offer evaluation and ongoing treatment for Peyronie's disease and related men's health concerns at stonewood.health/conditions/mens-health. Most major insurance plans are accepted, including Medicare, so getting this looked at should not require paying out of pocket on top of the coverage you already have.