Penile plaque is a flat, hardened buildup of fibrous tissue that forms inside the penis, specifically within the tough elastic layer called the tunica albuginea. This layer normally stretches evenly during an erection, but when plaque develops, it creates a stiff spot that pulls on surrounding tissue and causes the penis to curve or bend. The condition is known medically as Peyronie’s disease, and prevalence estimates range from less than 1% to as high as 13% of adult men, though many cases go unreported.
What the Plaque Is Made Of
The tunica albuginea is mostly made of type I collagen, a strong structural protein that gives it flexibility and strength. In Peyronie’s plaques, an abnormal amount of type III collagen appears. This type of collagen is barely detectable in healthy tissue but shows up prominently in plaque samples. The ratio of type III to type I collagen is significantly elevated, meaning the tissue has been restructured in a way that makes it stiffer and less elastic. Some plaques also contain calcium deposits, which can make them feel like a hard ridge or pebble under the skin.
How Plaque Forms
The most widely accepted explanation involves repeated minor injuries to the tunica albuginea during sexual activity or other physical stress. In men who are genetically susceptible, even small amounts of damage trigger an overblown healing response. The injury causes tiny blood vessel tears, which release a clotting protein called fibrin. Fibrin acts as a signal flare, attracting immune cells that flood the area with inflammatory molecules.
Here’s where things go wrong: during an erection, blood flows in through arteries but outflow through veins is restricted. That means the inflammatory molecules get trapped and can’t disperse normally. The result is excessive collagen production that destroys the delicate network of elastic fibers in the tunica. Over time, this disorganized scar tissue hardens into a distinct plaque.
What It Feels Like
Peyronie’s disease progresses through two phases. During the acute phase, which typically lasts 6 to 18 months, you may notice:
- Hard lumps on one or more sides of the penis, sometimes felt just under the skin
- Pain during erections or even at rest, caused by inflammation irritating nerve endings
- A developing curve that gradually becomes more noticeable with erections
- Changes in shape such as narrowing, indentation, or shortening
In the chronic phase, the plaque stabilizes. Pain usually decreases or resolves entirely, but the curvature remains. Erectile dysfunction may develop or worsen during this stage, partly because the plaque interferes with the normal blood-trapping mechanism that keeps an erection firm, and partly because the structural distortion makes intercourse difficult or impossible.
The emotional toll is significant. Depression, anxiety, and distress about sexual function or the appearance of the penis are common complications.
Connection to Other Fibrotic Conditions
Penile plaque doesn’t always occur in isolation. It shares a biological link with Dupuytren’s contracture, a similar buildup of fibrous tissue in the palm that causes fingers to curl inward, and Ledderhose disease, which affects the soles of the feet. These three conditions are considered manifestations of a shared tendency toward excessive scar tissue formation. If you have one, your risk of developing another is higher than average.
How Plaque Is Diagnosed
A doctor can often feel the plaque during a physical exam. For a more detailed picture, high-frequency ultrasound can reveal the size, location, and density of the plaque. Ultrasound findings fall into three general categories: soft fibrous plaques with no calcium deposits, plaques with scattered calcified spots, and dense, heavily calcified plaques. The degree of calcification matters because it influences which treatments are likely to work. Heavily calcified plaques tend to be more resistant to nonsurgical approaches.
Injection Treatment
The only FDA-approved injection for Peyronie’s disease uses an enzyme that breaks down the proteins holding plaque together. It’s approved for curvatures greater than 30 degrees and is delivered directly into the plaque over a series of treatment cycles, typically up to 8 injections total.
In clinical trials, men who responded to treatment saw an average curvature reduction of about 17 degrees, or roughly 34%. A larger follow-up study found similar results, with responders averaging a 22-degree improvement, about 41% correction. Men with more severe starting curvatures (60 degrees or more) actually had the highest response rates at 60%, while those with milder curves below 30 degrees responded only 29% of the time. This likely reflects the fact that milder curves have less room for measurable improvement.
Traction Devices
Penile traction therapy uses a mechanical stretching device worn for several hours a day over months. The goal is to gradually remodel the plaque through sustained gentle force. Study protocols vary, but most require a minimum of 2 to 5 hours of daily use, with some programs encouraging up to 8 or even 12 hours per day. Treatment periods range from 3 to 6 months. In practice, men in studies averaged about 5.5 hours of daily use. Traction is sometimes used after surgery as well, starting about 2 to 3 weeks after the incision heals, to help maintain length and prevent recurrence of curvature.
Surgical Options
Surgery is generally reserved for the chronic phase, once the plaque has stabilized and the curvature is no longer changing. There are two main approaches, and the choice depends on how complex the deformity is and whether erectile function is intact.
Plication is the simpler procedure. It works by shortening the longer side of the penis to match the plaque-affected side, straightening the curve without touching the plaque itself. It’s best suited for men with a straightforward curve and good erectile function. In a study tracking 57 men over a median of about four years, 90% were satisfied with the cosmetic result, though only 71% reported fully satisfactory sexual function afterward.
Plaque incision with grafting is a more involved surgery. The surgeon cuts into or partially removes the plaque, then patches the area with a graft. This approach is necessary for more complex deformities like hourglass shapes, bottleneck narrowing, or lateral indentations that plication can’t correct. Early results are strong, with straightening rates of 59% to 96% and satisfaction rates up to 92% in the first year. However, five-year follow-up data shows these results don’t always hold up over time. About 40% of men in one study reported a perception of penile shortening, even though objective measurements showed no change in length.
For men with both significant curvature and erectile dysfunction, a penile implant may be the most practical option, as it addresses both problems simultaneously.