A vaginal ulcer is an open sore or break in the mucosal lining of the vagina, vulva, or surrounding genital tissue. These ulcers range from tiny, barely visible erosions to deep, painful craters, and they can stem from infections, autoimmune conditions, medications, physical trauma, or causes that are never fully identified. Herpes simplex virus is the single most common cause of genital ulcers in the United States, but the list of possibilities extends well beyond sexually transmitted infections, which matters because the cause shapes both the treatment and the outlook.
What Counts as a Vaginal or Vulvar Ulcer
The term “vaginal ulcer” is used loosely in everyday conversation. Medically, these sores can appear on the vaginal canal itself, on the vulva (the external tissue including the labia), on the perineum, or in the perianal area. Clinicians often group them under “genital ulcers” because the causes and evaluation overlap regardless of exact location. Ulcers differ from simple irritation or a rash in that the surface layer of tissue is fully broken, exposing the tissue underneath. That open wound is what makes ulcers painful, prone to secondary infection, and sometimes slow to heal.
When a clinician evaluates a genital ulcer, the physical characteristics of the sore itself offer clues. Infectious-disease specialists look at the margin of the ulcer, the texture of its edge, the appearance of its base, and whether nearby lymph nodes are swollen, tender, or firm. These features help narrow down the cause before lab results come back.
Infectious Causes
Most genital ulcers seen in clinical settings are caused by sexually transmitted infections. The three organisms encountered most often worldwide are herpes simplex virus, the bacterium that causes syphilis (Treponema pallidum), and, less commonly, Haemophilus ducreyi, the agent behind chancroid. In rarer cases, Klebsiella granulomatis (granuloma inguinale) and certain strains of Chlamydia trachomatis (lymphogranuloma venereum) are responsible.
Herpes Simplex Virus
HSV-2 has historically been the main culprit behind genital herpes, but HSV-1, traditionally thought of as a cause of cold sores, is an increasingly important cause of genital ulcers as well. The virus enters the body through tiny abrasions in the skin or mucosa, replicates locally, and then travels along sensory nerves to settle in nerve clusters near the spinal cord. It can stay dormant there for months or years before reactivating and causing a new outbreak.
The appearance and severity of herpes ulcers vary widely. A primary outbreak in someone who has never been exposed to either type of HSV tends to be more severe on average, with clusters of painful blisters that break open into shallow ulcers. But most primary infections are actually asymptomatic, meaning many people carrying the virus never realize they have it. Recurrent episodes are usually milder and shorter, and some people shed the virus without any visible sores at all, which fuels ongoing transmission.
Syphilis
The hallmark of primary syphilis is the chancre, a single, painless, firm ulcer that appears at the site of infection. Because it does not hurt, a chancre inside the vaginal canal can go completely unnoticed. Without treatment, syphilis progresses through secondary and later stages that involve very different symptoms, so catching the initial ulcer matters. Syphilis rates have been climbing in many countries, making it an important consideration whenever a genital ulcer appears.
Less Common Sexually Transmitted Infections
Chancroid, caused by Haemophilus ducreyi, produces one or more painful, soft, ragged ulcers, often with tender swollen lymph nodes in the groin. It is uncommon in high-income countries but remains relevant in parts of sub-Saharan Africa and Southeast Asia. Granuloma inguinale and lymphogranuloma venereum are even rarer globally but produce distinctive ulcerative patterns, sometimes with significant tissue destruction if left untreated.
Non-Infectious Causes
Not every genital ulcer is caused by a pathogen, and this is where many people’s assumptions go wrong. A number of conditions that have nothing to do with sexual activity can produce painful vulvar or vaginal sores.
Lipschütz Ulcers
Lipschütz ulcers, sometimes called acute genital ulcers of the young, typically appear in adolescents and young women who are not sexually active. They come on suddenly, often alongside flu-like symptoms such as fever, fatigue, and body aches, and they present as one or more deep, painful ulcers on the vulva. The exact trigger is debated, but some cases have been linked to systemic viral infections such as Epstein-Barr virus. Diagnosis is largely clinical, made after ruling out sexually transmitted causes. The good news is that these ulcers usually heal on their own within about two weeks and do not tend to recur.
Behçet Disease
Behçet disease is a chronic inflammatory condition that causes recurrent oral ulcers and, in over three-quarters of patients, genital ulcers as well. In women, these ulcers most commonly appear on the vulva along the labia. They resemble oral canker sores and are usually painful. Unlike oral ulcers in Behçet disease, genital ulcers tend to recur less frequently, but they often leave scars after healing. Behçet disease is driven by immune-system dysfunction, with genetic susceptibility playing a strong role, and it can also affect the eyes, joints, blood vessels, and nervous system.
The relapsing nature of Behçet disease and the intimate location of the ulcers create significant psychological and relationship challenges. Research on women with Behçet disease has found that genital symptoms, combined with a lack of knowledge about the condition and the side effects of medications, put patients at risk for problems with intimacy and emotional well-being. These issues often go unaddressed unless clinicians specifically ask about them during consultations.
Skin Conditions
Chronic vulvar dermatoses can also cause ulceration. Erosive lichen planus is a particularly stubborn example. It produces raw, painful erosions on the vulvar and vaginal mucosa that can persist for years. In some patients, lichen planus overlaps with lichen sclerosus, a separate condition that causes white, thickened patches and can lead to scarring that changes the anatomy of the vulva over time. One reported case involved a woman with a twenty-year history of ulcerative vulvo-vaginitis initially misdiagnosed as a different condition before erosive lichen planus was confirmed, illustrating how tricky these diagnoses can be.
Drug Reactions
Certain medications can trigger a reaction called a fixed drug eruption, where the same area of skin blisters and ulcerates each time the drug is taken. The vulva is a known site for this reaction. One documented case involved a woman who developed painful vulvar blisters and ulceration repeatedly after taking fluconazole, a common antifungal. Other medications associated with fixed drug eruptions include certain antibiotics and nonsteroidal anti-inflammatory drugs. The pattern of recurrence in the same spot after the same medication is the key diagnostic clue.
Trauma and Tampon Use
Physical injury from sexual activity, childbirth, or even routine products can damage the vaginal lining. Research has shown that tampon use can cause drying of the vaginal mucosa, disruption of the surface cell layer, and microulcerations. Products containing superabsorbent materials were found to be significantly more likely to produce these tiny ulcers than conventional tampons, especially when used outside of active menstruation when flow is minimal. These changes are typically transient and heal once the tampon is removed, but they underscore why product choice and timing of use matter.
How Symptoms Differ by Cause
One of the frustrations with genital ulcers is that many of them look similar at first glance. Still, certain symptom patterns can point a clinician in the right direction before lab tests return:
- Herpes: Multiple small, grouped, painful blisters that break into shallow ulcers. Often accompanied by tingling or burning beforehand. Recurrences happen in the same general area.
- Syphilis: A single, painless, clean-edged ulcer with a firm base. Painless lymph node swelling may be present.
- Chancroid: One or more painful, soft ulcers with ragged edges and a purulent base. Tender, swollen inguinal lymph nodes that may drain.
- Lipschütz ulcers: Sudden onset of deep, painful vulvar ulcers in a young person, often with preceding fever and malaise. No sexual exposure history.
- Behçet disease: Recurrent oral and genital ulcers, often with eye inflammation or skin lesions. Genital ulcers may scar.
- Drug reaction: Blistering and ulceration at the same site recurring after the same medication. The timeline following drug intake is consistent.
These patterns are guidelines, not rules. Herpes ulcers can sometimes appear as a single sore mimicking a chancre. Syphilis chancres can occasionally be painful. In some cases, no pathogen is identified at all despite thorough testing.
Getting a Diagnosis
Because visual inspection alone is unreliable for many genital ulcers, laboratory testing plays a central role. For suspected herpes, viral culture or PCR-based testing of a swab from the ulcer is the standard approach. Syphilis is diagnosed through a combination of blood tests that detect antibodies. For less common infections, specialized culture or molecular testing may be needed.
Nucleic acid amplification tests, which detect tiny amounts of pathogen DNA, have become the gold standard for diagnosing sexually transmitted genital ulcer disease. Multiplex versions of these tests can screen for several pathogens at once from a single swab, which speeds up diagnosis and reduces the chance that an uncommon cause is missed.
When STI testing comes back negative and the clinical picture does not point to infection, clinicians broaden the search. A tissue biopsy may be taken to look for signs of autoimmune disease, a chronic skin condition, or, rarely, malignancy. Blood tests for markers of Behçet disease or other systemic inflammatory conditions may be ordered. For adolescents and women without sexual exposure, the diagnosis of Lipschütz ulcers is made primarily by excluding other causes.
Treatment Options
Treatment depends entirely on the underlying cause, which is why accurate diagnosis is so important. There is no one-size-fits-all approach.
Treating Infectious Ulcers
Genital herpes is managed with antiviral medications such as acyclovir, valacyclovir, or famciclovir. These drugs shorten outbreaks and reduce viral shedding but do not eliminate the virus from the body. People with frequent recurrences can take a daily suppressive dose to reduce the number of outbreaks per year. Syphilis is treated with penicillin, and early-stage disease typically responds well to a single injection. Chancroid is treated with antibiotics, and granuloma inguinale and lymphogranuloma venereum each have their own antibiotic regimens.
Treating Non-Infectious Ulcers
For non-sexually acquired genital ulcers, including Lipschütz ulcers and idiopathic aphthous ulcers, corticosteroids are the mainstay of treatment. In a study of 26 girls and women with these ulcers, those with moderate to severe disease were started on oral prednisolone. The vast majority achieved rapid pain relief and complete healing within about two weeks. Patients with milder ulcers were treated with topical corticosteroids alone, and most also healed well. To prevent recurrence, some patients were started on low-dose doxycycline as a prophylactic measure, and none of those on prophylaxis reported any recurrences during a follow-up period averaging over eighteen months.
Behçet disease requires long-term management rather than a one-time cure. Treatment may involve colchicine, immunosuppressants, or biologic therapies depending on the severity and which organ systems are involved. The genital ulcers of Behçet disease often respond to topical corticosteroids for acute flares, but controlling the underlying disease is necessary to reduce recurrences.
Chronic vulvar dermatoses like erosive lichen planus are typically managed with potent topical corticosteroids such as clobetasol. Treatment is often prolonged, and response can be incomplete. Drug-induced ulcers resolve once the offending medication is identified and discontinued.
Comfort Measures
Regardless of the cause, genital ulcers are painful, and symptomatic relief matters while waiting for treatment to work. Sitz baths in lukewarm water, topical lidocaine gel, and loose cotton underwear all help reduce discomfort. Urinating can be excruciating when urine contacts open sores; pouring warm water over the area during urination or urinating in a shallow bath can ease the sting. Keeping the area clean and dry, and avoiding irritants like scented soaps or tight clothing, supports healing.
When Ulcers Signal Something More Serious
In most cases, genital ulcers are caused by treatable infections or self-limiting conditions. But occasionally, an ulcer that does not heal or looks unusual turns out to be something that demands urgent attention.
Vulvar cancer, though uncommon, can present as a persistent ulcer or lump on the vulva. Most women with vulvar cancer first notice itching, pain, or a visible sore that will not go away. Any vulvar ulcer that persists beyond a few weeks despite treatment warrants a biopsy to rule out malignancy.
Chronic genital ulceration that goes untreated can also lead to scarring and anatomical changes. In Behçet disease, repeated ulceration of the labia can result in permanent scarring. In women who have undergone certain types of stem cell transplant, chronic graft-versus-host disease can cause vulvar and vaginal inflammation that progresses from irritation and ulceration to adhesions, where tissue surfaces fuse together. Early recognition and treatment of these inflammatory changes is critical to prevent permanent structural damage that can affect urination, sexual function, and quality of life.
Genital Ulcers in Adolescents
Genital ulcers in teenagers present a particular diagnostic and emotional challenge. When an adolescent presents with vulvar sores, the immediate concern for both families and clinicians often centers on sexually transmitted infections. But the differential diagnosis in this age group is broad, encompassing aphthous ulcers, Lipschütz ulcers, fixed drug eruptions, trauma, and autoimmune conditions alongside STIs. Jumping to conclusions about sexual activity can damage trust and delay the correct diagnosis.
Lipschütz ulcers deserve special mention here because they disproportionately affect young women, often those who have never been sexually active. The acute onset of deep, painful vulvar ulcers accompanied by systemic illness in a teenager can be alarming for both the patient and her family. Reassurance that the condition is not an STI, that it typically resolves within two weeks, and that recurrence is uncommon is an important part of management.
The Link Between Genital Ulcers and HIV Risk
Open sores on the genital mucosa disrupt the body’s natural barrier to infection. This is not just a theoretical concern. Genital ulcer disease, particularly from herpes and syphilis, is a well-documented risk factor for acquiring and transmitting HIV. The ulcer provides a direct entry point for the virus, and the immune cells that flood the area to fight the ulcer are the same cells HIV targets. In regions where both HSV-2 and HIV are common, the interaction between the two infections is a major public health problem. The high number of undiagnosed herpes cases, the frequency of atypical or unrecognized outbreaks, and asymptomatic viral shedding all contribute to ongoing transmission of both viruses. The lack of affordable diagnostic tools and antiviral treatment in lower-income countries compounds the problem.
Reducing the Chance of Recurrence
For herpes, daily suppressive antiviral therapy is the most effective way to cut down on outbreaks. Consistent condom use reduces, but does not eliminate, transmission risk because the virus can shed from skin not covered by the condom. Recognizing prodromal symptoms like tingling or itching and avoiding sexual contact during those times also helps.
For non-infectious recurrent ulcers, low-dose doxycycline prophylaxis has shown promise. In the study of non-sexually acquired genital ulcers described earlier, none of the patients who started doxycycline prophylaxis reported recurrences during follow-up. For Behçet disease, keeping the underlying inflammation controlled with systemic therapy is the best strategy to reduce genital flares.
Practical measures apply broadly. Avoiding known medication triggers prevents fixed drug eruptions. Choosing lower-absorbency tampons and using them only during active flow reduces the risk of tampon-related mucosal damage. Maintaining good vulvar hygiene without over-washing or using harsh products supports the integrity of the genital skin barrier.
Why Talking About It Matters
Genital ulcers carry a stigma that discourages many people from seeking care promptly or discussing their symptoms openly. Research on women with Behçet disease found that genital symptoms affected intimate relationships and psychological well-being, yet these issues were rarely raised during medical appointments unless the clinician brought them up first. The same dynamic plays out across all causes of genital ulcers: embarrassment delays diagnosis, isolation compounds suffering, and silence lets treatable conditions worsen. If you are dealing with a genital ulcer, the most productive thing you can do is get it evaluated early, because the cause determines the treatment and the majority of causes are manageable once identified.