Penile Fibrosis: Causes, Symptoms, and Treatments

Penile fibrosis is an abnormal buildup of scar-like collagen tissue within the penis that replaces the flexible smooth muscle normally responsible for healthy erections. It can occur in the tough outer sheath of the erectile chambers (the tunica albuginea), inside the erectile tissue itself, along the septum between the two chambers, or in the penile blood vessels. The most recognized form is Peyronie’s disease, where a fibrous plaque develops in the tunica and causes the penis to curve, but fibrosis can also follow pelvic surgery, prolonged erections, infections, and other insults to penile tissue. Understanding how this scarring starts, what it feels like at different stages, and how it can be managed makes a real difference in outcomes because early recognition opens up treatment options that may not be available once the scar tissue fully matures.

How Penile Fibrosis Develops

At its core, penile fibrosis follows the same wound-healing logic as scarring anywhere else in the body, but with consequences unique to erectile tissue. When healthy smooth muscle cells in the penis are damaged, the body sends repair signals that trigger collagen production and draw inflammatory cells to the site. In a normal healing process, the excess collagen is gradually cleared and the tissue remodels back toward its original architecture. In penile fibrosis, that remodeling stalls. Collagen and other structural proteins keep piling up, smooth muscle cells either die off or transform into scar-producing cells, and the tissue loses its ability to stretch and fill with blood the way it needs to during an erection.¹

Several well-established triggers can set this cascade in motion. The causes are worth understanding individually because they influence which part of the penis is affected, how quickly fibrosis progresses, and which treatments apply.

Repetitive Microtrauma

The dominant explanation for Peyronie’s disease is that small, often unnoticed injuries to the tunica albuginea during sexual activity cause microvascular damage. Fibrin, the protein involved in blood clotting, leaks into the tissue at the injury site. Normally the body clears that fibrin during wound repair, but in susceptible individuals, the fibrin is not adequately removed, and repeated micro-injuries keep adding more. Fibroblasts activate, collagen gets trapped, and a pathological plaque forms over time.² Animal studies reinforcing this model have shown that repeated micro-injuries to the tunica produce progressively worse curvature, fibrous plaques, broken elastic fibers, and reduced erectile function compared with a single injury.³

Pelvic Surgery and Nerve Injury

Radical prostatectomy, the surgical removal of the prostate gland for cancer, is one of the clearest iatrogenic causes. Even when surgeons spare the nerves responsible for erections, the procedure disrupts blood flow and oxygen delivery to the penis. A pilot study following men after prostatectomy found that all participants developed fibrotic changes and calcification visible on ultrasound, along with a significant drop in penile oxygen levels and erectile function scores.⁴ The mechanism appears to center on oxygen deprivation: when the nerves that regulate penile blood flow are injured, the tissue receives less oxygen even at rest, and low-oxygen conditions push the tissue toward scarring rather than healthy maintenance.⁵

Prolonged Erections and Infection

Ischemic priapism, a painful erection that persists for hours because blood cannot drain from the erectile chambers, creates a different but equally damaging environment. Structural analysis of tissue from men with ischemic priapism has shown significantly more fibrous connective tissue and significantly fewer smooth muscle fibers compared with healthy controls, which helps explain why erectile dysfunction is so common after prolonged priapism episodes.⁶ Penile infections and complications from prior penile implant surgery can also produce dense fibrosis, creating situations of high surgical complexity if future treatment is needed.⁷

Genetic Susceptibility

Not every man who experiences penile microtrauma develops fibrosis, which points to a genetic component. Peyronie’s disease shares molecular pathways with Dupuytren’s contracture, a fibrotic condition of the hand. Research has identified common upregulated gene families in both diseases involved in collagen breakdown, bone-like tissue formation, and the transformation of normal fibroblasts into scar-producing myofibroblasts, with a particular overlap in a signaling pathway called WNT.⁸ If you have Dupuytren’s contracture or a family history of fibrotic conditions, your risk of developing Peyronie’s disease may be higher.

What Penile Fibrosis Feels Like

Peyronie’s disease, the most common clinical presentation of penile fibrosis, is typically divided into two phases: an active (acute) phase and a stable (chronic) phase. Recognizing which phase you are in matters because treatment recommendations differ substantially between the two.

During the active phase, which commonly lasts six to eighteen months, the hallmarks are a developing or changing penile deformity, a soft or still-forming plaque that may be palpable under the skin, and pain during erections or even at rest. Curvature worsens in roughly a fifth to half of men during this phase, stays the same in about a third to two-thirds, and spontaneously improves in a small minority. Pain usually eases or resolves within the first twelve months.⁹

The stable phase begins once curvature has not changed for at least three to six months and pain has resolved. The plaque hardens, and in some men it calcifies. Other deformities can appear at this stage, including an hourglass narrowing, a hinge effect (where the penis buckles at the plaque site during penetration), and shortening of the penis.⁹ About 40% of men in one natural-history study believed their disease gradually progressed over time, while roughly the same proportion felt it stayed the same, and only about 13% perceived gradual resolution.¹⁰

Erectile dysfunction frequently accompanies penile fibrosis regardless of its cause. When fibrosis occurs inside the erectile chambers rather than in the tunica, it can directly impair the tissue’s ability to expand and trap blood. Doppler ultrasound studies of a large male population found that intracavernosal fibrosis correlated strongly with difficulty maintaining erections.¹¹ Some men experience erection problems without noticeable curvature, which can make fibrosis harder to suspect without imaging.

How Penile Fibrosis Is Diagnosed

A physical exam can often detect a palpable plaque in the tunica, and a patient’s description of curvature direction and degree during erections gives the clinician essential baseline information. Many urologists ask patients to photograph the erect penis at home to document the deformity, since curvature cannot be evaluated in a flaccid state in the office.

Penile Doppler ultrasound is the primary imaging tool. It can identify tunical thickening, intracavernosal fibrosis, septal fibrosis, and calcification, while also measuring blood flow dynamics to assess whether the erection mechanism is intact.¹¹ Ultrasound elastography is a newer technique gaining ground. A review of the technology found it useful for identifying plaques that standard ultrasound or physical examination cannot detect, and for monitoring changes during and after conservative treatment.¹² This is especially valuable in early-stage disease, where plaques are soft and may not yet show up on conventional imaging.

The Psychological Burden

Penile fibrosis exerts psychological effects that are easy to underestimate from the outside. In reviews of the literature, as many as 81% of men with Peyronie’s disease reported emotional difficulties, about half met criteria for clinically meaningful depression, and over half reported relationship problems directly attributed to the condition.¹³ Men describe themselves in terms like “abnormal,” “ugly,” and “half a man,” and many lose their confidence to initiate sexual encounters or even discuss the problem with partners or doctors.¹⁴

The stigma and isolation feed on themselves. A man who feels ashamed avoids intimacy, which strains the relationship, which deepens the emotional distress. That same study noted that 77% of men reported psychological effects, which worsened in over a third of them over time.¹⁰ Addressing the mental-health dimension alongside physical treatment is not optional; it is part of comprehensive care.

Non-Surgical Treatment Options

Treatment for penile fibrosis depends heavily on which phase the disease is in, how severe the deformity is, and whether erectile function is preserved. During the active phase, when the plaque is still evolving, the goal is to limit progression and manage symptoms. During the stable phase, the emphasis shifts to correcting the deformity.

Oral Medications and Traction Therapy

Several oral medications have been studied in active-phase disease. Pentoxifylline, a drug that improves blood flow and has antifibrotic properties, and colchicine, an anti-inflammatory agent, are among the most commonly tried. When either medication was combined with penile traction therapy (a device that applies a gentle stretch to the penis over hours each day), one study found a significant decrease in curvature after six months and a significant reduction in plaque size.¹⁵ Traction therapy on its own is one of the few conservative approaches with a reasonable evidence base, primarily because it mechanically remodels the plaque over time and can help preserve or recover penile length.

Collagenase Injections

Intralesional injection of collagenase clostridium histolyticum (CCH) was the first drug approved by the U.S. FDA specifically for Peyronie’s disease.¹⁶ The enzyme works by breaking down the collagen that makes up the plaque. Clinical trials and post-approval studies involving more than 1,500 patients have consistently shown that CCH reduces penile curvature, softens the plaque, and improves quality-of-life measures.¹⁷ The standard treatment protocol involves a series of injections given in cycles, typically with gentle manual modeling (bending the penis opposite to the curvature) between injection sessions. Availability has fluctuated in some markets, so patients should check with their urologist about current access.

Shockwave Therapy

Extracorporeal shockwave therapy (ESWT) uses focused acoustic waves directed at the plaque. Randomized controlled trials have not demonstrated a clear benefit for curvature reduction or erectile function, but a consistent finding across multiple studies is a significant reduction in penile pain.¹⁸ That makes shockwave therapy most useful during the active phase when pain is the dominant complaint, rather than as a curvature-correcting strategy. Some men find the pain relief meaningful enough to justify the treatment even without straightening.

When Surgery Is the Right Choice

Surgery is generally reserved for men with stable disease who have functionally significant curvature that interferes with sexual activity. The guiding principle is to match the procedure to the severity of the deformity and the quality of the man’s remaining erectile function.

For men with good erections and curvature under about 70 degrees without narrowing or hinge effects, tunica albuginea plication is the preferred approach. This technique shortens the longer side of the penis by placing permanent sutures that fold the tunica, effectively straightening the shaft without touching the plaque. It is the simplest surgical option and carries the lowest risk of erectile complications, though it does result in some penile shortening.¹⁹

Men with more complex deformities but preserved erections are candidates for plaque incision or partial excision and grafting. The surgeon cuts into or removes part of the plaque and patches the gap with graft material, which can come from the patient’s own tissue or a processed biological graft. Even in men with severe compound curvatures, this approach has shown durable results: about 80% of patients were able to have penetrative sex after surgery, with low rates of recurrent curvature and no significant loss of penile length compared with simpler cases.²⁰

When erectile dysfunction accompanies severe fibrosis and the man cannot achieve erections adequate for grafting procedures, a penile prosthesis (implant) becomes the treatment of choice. This simultaneously corrects the deformity and restores the ability to have intercourse. Dense fibrosis, whether from prior infection, device explantation, or advanced disease, makes implant surgery technically demanding. Specialized implant models and surgical instruments have been developed for these high-complexity cases.²¹

Preventing Fibrosis After Prostate Surgery

Because post-prostatectomy fibrosis follows a predictable sequence of nerve injury, oxygen deprivation, and smooth-muscle loss, there is a window after surgery in which preventive treatment may help. The concept of “penile rehabilitation” emerged from early observations that men who used regular blood-flow-promoting treatments after surgery had better long-term recovery of spontaneous erections. Chronic dosing of PDE5 inhibitors (the drug class that includes sildenafil and tadalafil) became a common rehabilitation strategy used by urologists after radical prostatectomy.²²

Preclinical research supports the biological rationale: in animal models, PDE5 inhibitors, nitric oxide donors, and even hyperbaric oxygen therapy all improved erectile function after nerve injury through antifibrotic effects and preservation of smooth muscle.⁵ The clinical evidence in humans is more mixed, and the ideal drug, dose, and timing remain debated. Still, many specialists recommend starting some form of pro-erectile therapy early after surgery rather than waiting to see if problems develop on their own.

Experimental Approaches on the Horizon

Researchers are exploring regenerative strategies that go beyond managing or removing scar tissue and instead attempt to restore healthy tissue architecture. Platelet-rich plasma (PRP) injections and stem cell therapy are the two most-discussed experimental treatments. Both aim to repair damaged tissue and promote new cellular and vascular growth. Early human trials for erectile dysfunction and Peyronie’s disease have shown promising results with few side effects, though the studies are still small and the optimal protocols are not established.²³

Another line of investigation focuses on magnetic stimulation. In a rat model, transpelvic magnetic stimulation enhanced blood flow to the penis after nerve injury and altered the elastin deposits in the erectile tissue, raising the possibility of a noninvasive tool for preventing fibrosis in men recovering from pelvic surgery.²⁴ These approaches are years away from routine clinical use, but they represent a shift in thinking from managing the consequences of fibrosis to trying to prevent or reverse the process at its source.

The Shared Biology of Fibrotic Conditions

One of the more interesting findings in recent research is that penile fibrosis does not exist in isolation. Men with Peyronie’s disease are more likely to develop Dupuytren’s contracture in the hand, and the reverse is also true. The two conditions share fibrotic signaling pathways, including common gene families involved in collagen breakdown, tissue calcification, and the transformation of normal connective-tissue cells into aggressive scar-producing myofibroblasts.⁸ Ledderhose disease, a fibrotic thickening of the connective tissue on the sole of the foot, is another condition in this family.

This clustering suggests that some people carry a generalized susceptibility to aberrant wound healing, not just in one organ but throughout the body’s connective tissues. For patients, the practical implication is straightforward: if you have one of these conditions, mention it to your doctor if symptoms of another appear. Early recognition in a person already known to be fibrosis-prone can lead to earlier intervention, when conservative treatments are more likely to help.

1
PubMed. Mechanisms of penile fibrosis
2
PubMed. Proposal: trauma as the cause of the Peyronie’s lesion
3
PubMed. Repeated Micro-Trauma of the Penile Tunica Albuginea: A New Animal Model of Peyronie’s Disease
4
The Journal of Sexual Medicine. Radical prostatectomy can cause penile hypoxia, fibrosis, and calcifications: a pilot study
5
PubMed Central. Preclinical evidence for the benefits of penile rehabilitation therapy following nerve-sparing radical prostatectomy
6
PubMed. Structural analysis of the corpora cavernosa in patients with ischaemic priapism
7
PubMed. Surgical implant options in patients with penile fibrosis due to infection or previous explants
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9
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10
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11
PubMed. Penile Doppler sonographic and clinical characteristics in Peyronie’s disease and/or erectile dysfunction: an analysis of 1500 men with male sexual dysfunction
12
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13
PubMed. Psychological impact of Peyronie’s disease: a review
14
PubMed Central. Psychological aspects of Peyronie’s disease
15
PubMed Central. Evaluation of Oral Pentoxifylline, Colchicine, and Penile Traction for the Management of Peyronie’s Disease
16
PubMed Central. Intralesional collagenase in the treatment of Peyronie’s disease
17
PubMed Central. Collagenase Clostridium Histolyticum in the Treatment of Peyronie’s Disease: Review of a Minimally Invasive Treatment Option
18
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19
PubMed Central. Surgery for Peyronie’s disease
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The Journal of Sexual Medicine. Surgical Outcomes of Plaque Excision and Grafting and Supplemental Tunica Albuginea Plication for Treatment of Peyronie’s Disease With Severe Compound Curvature
21
PubMed Central. Penile fibrosis—still scarring urologists today: a narrative review
22
PubMed Central. Penile rehabilitation therapy with PDE-V inhibitors following radical prostatectomy: proceed with caution
23
PubMed Central. The potential of platelet-rich plasma injections and stem cell therapy for penile rejuvenation
24
PubMed Central. Transpelvic Magnetic Stimulation Enhances Penile Microvascular Perfusion in a Rat Model: A Novel Interventional Strategy to Prevent Penile Fibrosis after Cavernosal Nerve Injury