Perineal ulcers are open sores that develop on the skin and soft tissue between the genitals and the anus, and they arise from a surprisingly wide range of causes. Prolonged moisture from incontinence, inflammatory bowel disease, sexually transmitted infections, autoimmune skin conditions, certain medications, and even cancer can all produce ulceration in this area. Because the perineum is warm, frequently moist, and subject to friction, wounds here tend to heal slowly and carry a high risk of infection, making early identification of the underlying cause essential for effective treatment.
Incontinence and Moisture-Related Damage
The single most common pathway to perineal skin breakdown in hospitalized and elderly patients is prolonged contact with urine or stool. When the skin sits in moisture for hours at a time, its outer barrier softens and weakens. Enzymes in feces, particularly digestive lipases and proteases, then attack the compromised skin directly. The result is incontinence-associated dermatitis, which starts as persistent redness and can progress to partial or full-thickness skin loss if left unchecked.1PubMed. Incontinence-Associated Dermatitis: Pathogenesis, Contributing Factors, Prevention and Management Options Friction from bedding, adult diapers, or repositioning compounds the damage, especially in older adults whose skin is thinner and less elastic.
What makes this cause distinct from a classic pressure ulcer is its origin in chemical irritation rather than sustained pressure on a bony prominence. In practice the two often overlap: a bedridden patient who is also incontinent may develop a moisture-driven ulcer on the perineum at the same time as a pressure injury on the sacrum. Clinicians sometimes struggle to tell them apart, and the distinction matters because the treatment priorities differ. Moisture-related damage calls for aggressive skin protection and continence management, while pressure injuries demand offloading and redistribution of body weight.
Inflammatory Bowel Disease
Crohn’s disease has a particular affinity for the perianal and perineal region. The disease can produce deep, cavitating ulcers in the skin around the anus that burrow into surrounding tissue, sometimes forming fistula tracts that connect the bowel to the skin surface. These ulcers tend to be painful, slow to heal, and prone to secondary infection.2PubMed Central. Perianal Crohn’s Disease In many patients they are the first sign that Crohn’s disease is present, appearing before any abdominal symptoms develop.
Management of Crohn’s-related perineal ulcers usually combines systemic therapy for the underlying inflammation with local wound care. Biologic medications that target tumor necrosis factor are a mainstay, and antibiotics are used to control infection. A French national consensus on managing anal ulcerations in Crohn’s disease emphasizes algorithm-based decision-making, tailoring treatment intensity to the severity and location of the lesions.3Techniques in Coloproctology. How to manage anal ulcerations and anorectal stenosis in Crohn’s disease: algorithm-based decision making Surgery is generally reserved for complications like abscesses or strictures rather than used as a first-line approach.
Sexually Transmitted Infections
Genital and perineal ulcers are a hallmark of several sexually transmitted infections. Globally, herpes simplex virus (particularly type 2) is the leading infectious cause of genital ulcer disease, followed by syphilis caused by the bacterium Treponema pallidum.4PubMed Central. Genital ulcer disease: A review Less common but still seen in certain regions are chancroid, granuloma inguinale, and lymphogranuloma venereum. Herpes simplex type 1, traditionally associated with cold sores around the mouth, has been increasingly recognized as a cause of genital ulceration as well.
One of the persistent challenges with STI-related perineal ulcers is that they frequently look atypical. A textbook syphilis chancre is painless with a clean, raised border, while herpes classically produces clusters of small, painful blisters that break open into shallow ulcers. In real patients, though, these patterns overlap and can be hard to tell apart on sight alone.5PubMed Central. Genital ulcers caused by sexually transmitted agents Co-infections with more than one pathogen at once muddy the picture further. That is why laboratory testing, including swabs for viral culture or PCR and blood tests for syphilis serology, is considered essential whenever an STI is suspected. Features clinicians pay attention to include the ulcer’s border, depth, base characteristics, and whether the nearby lymph nodes are swollen or tender.
Autoimmune and Inflammatory Skin Conditions
Two autoimmune conditions deserve special mention because they can produce dramatic perineal ulceration and are frequently confused with each other. Behçet’s disease causes recurrent ulcers of the mouth and genitals along with eye inflammation and other systemic problems. Pyoderma gangrenosum produces rapidly enlarging, deeply destructive ulcers with undermined, violaceous borders that can appear almost anywhere on the body, including the perineum and genital area.
Distinguishing between these two conditions can be genuinely difficult. One reported case initially diagnosed as Behçet’s disease, based on oral, vaginal, and perineal ulcers along with intestinal involvement, was ultimately reclassified as pyoderma gangrenosum after a bone marrow biopsy revealed an underlying blood disorder and the wound characteristics shifted to match pyoderma gangrenosum’s distinctive destructive pattern.6PubMed. Case of pyoderma gangrenosum showing oral and genital ulcers, misdiagnosed as Behcet’s disease at first medical examination The two conditions can also coexist in the same patient.7PubMed Central. Genital Ulcerative Pyoderma Gangrenosum in Behçet’s Disease: A Case Report and Review of the Literature
External triggers can flare either condition. A case report described a young woman with both Behçet’s disease and pyoderma gangrenosum who developed rapidly progressive painful skin ulcers following a COVID-19 infection.8PubMed Central. Exacerbation of Behcet’s Disease and Pyoderma Gangrenosum Following COVID-19 Infection: A Case Report This kind of post-infectious flare is a known phenomenon in autoimmune ulcerative conditions and underscores why perineal ulcers in younger patients without obvious causes warrant a thorough immunological workup.
Medication-Induced Perineal Ulcers
Certain drugs can cause ulceration in the perineal and genital area as a side effect, and this possibility is easy to overlook. Nicorandil, a medication used for angina, is one of the better-documented culprits. The ulcers it causes are characteristically large, deep, and persistent, with clean, punched-out edges. They do not respond to standard wound treatments, and no distinctive features show up on biopsy. The problem tends to occur at higher doses but has been reported at doses as low as 10 mg per day. Critically, the ulcers usually heal once the drug is stopped, and sometimes even reducing the dose is enough to trigger improvement.9American Journal of Obstetrics and Gynecology. Never forget medication as a cause: vaginal ulceration caused by nicorandil
Other medications associated with genital or perineal ulceration include methotrexate, hydroxyurea, and certain chemotherapy agents. The clinical lesson is straightforward: when a perineal ulcer defies standard treatment and no infection, autoimmune condition, or malignancy can be identified, a careful medication review is warranted. A drug-induced ulcer can persist for months or years if the offending agent is not recognized.
Malignancy as a Cause
Cancer should be on the radar for any chronic, nonhealing perineal ulcer, particularly in older adults. Squamous cell carcinoma can develop in the perianal and perineal skin, sometimes arising within a chronic wound or area of longstanding irritation. Extramammary Paget disease is a rarer malignancy that affects the genital and perineal skin, often presenting as a red, eczema-like patch that may be mistaken for a benign rash for years before ulceration develops.10Journal of the American Academy of Dermatology. Extramammary Paget disease. Part I. epidemiology, pathogenesis, clinical features, and diagnosis Biopsy of any perineal ulcer that does not follow an expected healing trajectory is important to rule out an underlying malignancy.
Radiation and Surgical Complications
Pelvic radiotherapy for cancers of the rectum, cervix, prostate, or bladder can damage the perineal tissues both during treatment and months to years afterward. Acute radiation effects include redness, moist desquamation, and superficial ulceration. Late effects, which appear after the treatment course has ended, involve progressive scarring, distortion of the perineum and vagina, and chronic wounds that resist healing because the blood supply to irradiated tissue is permanently impaired.11Cochrane Library. Interventions for treating sexual dysfunction following pelvic radiotherapy
Surgical wounds in the perineum also carry a high complication rate. After procedures like abdominoperineal resection, in which the rectum and anus are removed for cancer, the perineal wound closes over a large dead space that is prone to fluid collection and infection. Effective management of these wounds involves controlling sepsis, evaluating for any systemic disease that might impair healing, and sometimes diverting the fecal stream with a stoma to keep the wound clean.12PubMed Central. Management of nonhealing perineal wounds
Recognizing Symptoms
Perineal ulcers share a core set of symptoms regardless of the underlying cause. Pain is almost universal and can range from a persistent burning or stinging sensation to sharp, throbbing pain that worsens with sitting, walking, or bowel movements. The skin around the ulcer is typically red and swollen. Discharge ranging from clear serous fluid to frankly purulent material may be present, especially if secondary infection has set in. Bleeding, either from the ulcer base or its edges, is common with deeper wounds.
Some symptom patterns offer clues to the cause. Ulcers from incontinence-related skin breakdown tend to be superficial, diffuse, and located on skin that has been in direct contact with moisture. Crohn’s-related ulcers tend to be deeper, with overhanging edges, and may have visible fistula openings nearby. STI-related ulcers often appear alongside swollen inguinal lymph nodes. Pyoderma gangrenosum ulcers expand rapidly and have a distinctive undermined, dusky purple border. An ulcer with raised, rolled edges that bleeds easily should raise concern for malignancy. None of these patterns are reliable enough on their own to replace laboratory testing and biopsy when the diagnosis is unclear.
Wound Care and Negative Pressure Therapy
Local wound management is the foundation of treatment regardless of the ulcer’s cause. Keeping the wound clean, managing moisture, protecting surrounding skin, and selecting appropriate dressings all matter. For large or deep perineal wounds, negative pressure wound therapy (NPWT), which applies controlled suction through a sealed foam dressing, has become an increasingly important tool. In perineal wounds after abdominoperineal resection, NPWT significantly reduced infection rates compared with standard wound care.13PubMed Central. Incisional negative pressure wound therapy to reduce perineal wound infection after abdominoperineal resection
Applying NPWT to the perineum presents a practical challenge: the irregular contours of the area make it difficult to maintain an airtight seal, and air leakage can render the therapy ineffective. Research has shown that using hydrocolloid dressings to reinforce the seal substantially reduces the problem. In one study, air leakage dropped from about one in four applications with conventional placement to fewer than one in twelve with the hydrocolloid-assisted technique, and patients also had shorter hospital stays and fewer skin complications from the dressings themselves.14PubMed. Effect of hydrocolloid dressings on preventing air leakage when applying negative pressure wound therapy to the perineum, buttocks, and sacrococcygeal region
Surgical Options for Nonhealing Wounds
When a perineal wound refuses to close despite adequate local care and treatment of the underlying condition, surgical reconstruction may be needed. Local tissue flaps, in which nearby skin and muscle are rotated into the wound bed, are an effective approach for filling large perineal defects. Most flap repairs heal well, and the technique can preserve continence when the anal sphincter complex is involved. One important caveat is that flaps should generally be avoided in patients who have received pelvic radiation, because the impaired blood supply to irradiated tissue makes flap failure much more likely.15PubMed. Perineal reconstruction with local flaps: technique and results
Before any reconstruction, surgeons must rule out ongoing infection and uncontrolled systemic disease, both of which sabotage wound healing. In patients with active Crohn’s disease, for instance, optimizing medical therapy before attempting closure is usually more productive than rushing to the operating room. Fecal diversion through a temporary stoma may be necessary to protect a healing perineal wound from ongoing contamination.
Preventing Perineal Skin Breakdown in Incontinent Patients
For patients who are bedridden or incontinent, prevention is far more effective than treatment. Evidence-based skin care protocols that include gentle pH-balanced cleansing after each episode of incontinence, followed by application of a moisture barrier cream or ointment, significantly reduce the rate at which perineal skin deteriorates. One study comparing an evidence-based prevention bundle to standard care found that skin breakdown occurred in roughly a fifth of patients receiving the bundle, compared with more than half of those receiving standard care.16PubMed. Efficacy and Cost-Effectiveness Analysis of Evidence-Based Nursing Interventions to Maintain Tissue Integrity to Prevent Pressure Ulcers and Incontinence-Associated Dermatitis
The choice of barrier product matters from a cost standpoint as well. An economic evaluation of four different skin protection regimens in nursing home residents found that all regimens using a cleanser plus a moisture barrier kept incontinence-associated dermatitis rates low, but a polymer-based barrier film applied just three times per week provided comparable protection to products applied after every incontinence episode, at significantly lower cost.17Journal of Wound, Ostomy, and Continence Nursing. An Economic Evaluation of Four Skin Damage Prevention Regimens in Nursing Home Residents With Incontinence For facilities managing large numbers of incontinent patients, that kind of efficiency matters.
Perineal Ulcers in Infants and Neonates
Diaper rash is the most common skin problem in infancy, and in its milder forms it is self-limited. Severe variants, however, can produce genuine perineal ulceration. Jacquet erosive dermatitis is a rare form of diaper rash that occurs in infants with chronic diarrhea or fecal incontinence and produces deep ulcers in the perineal skin folds.18Journal of Dermatology Research and Therapy. Refractory Perianal Ulcers in a Neonate. Beyond the Diaper Rash When perineal ulcers in an infant do not respond to standard diaper care, clinicians need to think beyond irritant dermatitis.
Infections that would be unusual in healthy adults can cause perineal ulcers in newborns. Cytomegalovirus (CMV), for example, was identified as the cause of perineal papules, erosions, and ulcers in a preterm infant whose diagnosis was first suggested by skin biopsy and confirmed with blood testing.19Journal of the American Academy of Dermatology. Perineal ulcers in an infant: An unusual presentation of postnatal cytomegalovirus infection Vascular anomalies like infantile hemangiomas can also present with overlying skin breakdown that mimics an ulcer. The key point for parents and pediatricians alike is that perineal ulcers in a baby that persist or worsen despite appropriate diaper care deserve a closer look, including biopsy if the cause remains unclear.
Obstetric Perineal Wound Breakdown
Perineal tears during vaginal delivery and surgical episiotomies are repaired with sutures, but those sutures sometimes fail. When the wound edges separate, the result is a dehiscence that can leave a raw, ulcer-like defect in the perineum. This happens more commonly than many new mothers expect, and it creates both physical pain and significant anxiety during the early postpartum period.
The traditional approach to episiotomy dehiscence has been to let the wound heal on its own from the bottom up, a process called secondary intention that can take four to eight weeks and often leaves more scar tissue. More recent evidence supports early re-suturing instead. A 13-year review of this approach found that re-closing the wound soon after dehiscence produced positive outcomes with few complications, and healing times appeared shorter than those achieved by leaving the wound open.20European Journal of Obstetrics & Gynecology and Reproductive Biology. Early re-suturing of dehisced obstetric perineal wounds: A 13-year experience A small case series also explored physiotherapy-based approaches using radiofrequency and deep magnetotherapy, reporting healing times of 10 to 20 days and pain improvement within the first day of treatment.21PubMed Central. Short‐Term Effects in the Treatment of Episiotomy Dehiscence in Physiotherapy: A Novel Approach in a Case Series Report These results are preliminary, but they hint at a broader shift toward more active management rather than watchful waiting.
The Emotional Weight of Perineal Wounds
Chronic wounds in the genital and perineal area carry a psychosocial burden that goes beyond pain and physical limitation. The location makes it difficult to discuss with friends or family, and embarrassment can delay medical care. Sexual function is frequently affected, and the impact on intimate relationships can be substantial. Research on women with chronic vulvovaginal conditions found significant impairment in sexual function across nearly all participants, along with measurable effects on emotional well-being, relationships, and physical activity levels.22PubMed. Psychosocial impact of chronic vulvovagina conditions While that study focused on vulvovaginal disorders rather than perineal ulcers specifically, the overlap in location and symptom burden makes the findings broadly relevant.
Stigma around perineal conditions is real and measurable. Patients may avoid seeking care because they assume the problem is an STI and feel shame, or because they are uncomfortable undressing for examination. Healthcare providers can help by normalizing the conversation, asking about perineal symptoms routinely in at-risk populations (such as patients with Crohn’s disease or incontinence), and acknowledging the emotional toll alongside the physical one. Referral for psychological support or sexual health counseling is appropriate when the wound is chronic or when the patient reports significant distress.