Anogenital dysplasia is a condition where cells in the anus or genital area have changed and become abnormal. These cells are not cancer, but in some cases they can develop into cancer over time if not monitored or treated. Medical professionals focus on identifying dysplasia early and providing treatment options that can prevent it from progressing to a more serious disease.

Understanding the Goals of Treating Anogenital Dysplasia

When someone is diagnosed with anogenital dysplasia, the main goal of treatment is to prevent the abnormal cells from turning into cancer. This is why doctors call these changes “precancerous”—they signal a warning that something needs attention before it becomes a bigger problem. Treatment also aims to relieve any uncomfortable symptoms like itching, bleeding, or pain that some people experience, though many people with dysplasia have no symptoms at all.^[1]

The approach to treating anogenital dysplasia depends on several factors. Doctors consider where the abnormal cells are located—whether they are in the anus, vagina, vulva, cervix, penis, or scrotum. They also look at how severe the changes are, because not all dysplasia needs immediate treatment. Low-grade dysplasia, where cells look only slightly different from normal, often goes away on its own without any medical intervention. High-grade dysplasia, where cells look very abnormal, is more likely to need treatment because it has a higher chance of progressing to cancer.^[3]

Another important factor is the patient’s overall health and immune system. People with weakened immune systems, such as those living with HIV or taking medications that suppress the immune system after an organ transplant, may need more aggressive treatment and closer monitoring. The treatment plan also takes into account the patient’s age, sexual health history, and whether they have been exposed to the human papillomavirus (HPV), which is the main cause of most cases of anogenital dysplasia.^[1]

Medical societies and expert groups have developed guidelines to help doctors decide when to watch and wait versus when to treat. These guidelines are based on research and clinical experience. They recommend regular screening for people at higher risk, such as men who have sex with men, transgender women, people with HIV, and those with a history of cervical, vaginal, vulvar, or anal cancer.^[5]

Standard Treatment Approaches for Anogenital Dysplasia

The standard treatment for anogenital dysplasia varies depending on the grade of the abnormal cells and their location. For low-grade dysplasia, doctors often recommend active surveillance, which means regular monitoring without immediate treatment. During active surveillance, patients return for check-ups every few months to make sure the abnormal cells haven’t gotten worse. This approach works well because low-grade lesions frequently disappear on their own, especially in people with healthy immune systems.^[12]

When treatment is needed for high-grade dysplasia, one of the most common approaches is surgical excision. This means the doctor surgically removes the area of abnormal cells. The removed tissue is sent to a laboratory where specialists examine it under a microscope to confirm the diagnosis and make sure all the abnormal cells were taken out. Surgical excision works well for small, isolated areas of dysplasia. However, it can cause complications if large areas need to be removed, including anal stenosis (narrowing of the anal canal) or fecal incontinence (difficulty controlling bowel movements).^[15]

Ablation is another standard treatment method that destroys abnormal cells rather than cutting them out. Several types of ablation are used. Hyfrecation or electrocautery uses heat from an electrical current to burn away the abnormal tissue. Infrared coagulation uses high-heat infrared light to destroy cells. Cryotherapy freezes the abnormal tissue, causing it to die and fall off. These procedures are usually performed in a doctor’s office with local anesthesia (numbing medicine) to reduce discomfort. Most people can go home the same day.^[7][13]

For anal dysplasia specifically, doctors often use a specialized technique called high-resolution anoscopy or HRA. This procedure helps doctors see the abnormal areas more clearly. During HRA, the doctor inserts a thin tube called an anoscope into the anus. A special microscope called a colposcope (which stays outside the body) magnifies the tissue, and liquid stains are applied to help identify abnormal cells. If the doctor finds areas that need treatment, they can remove them right away or plan for treatment at a later visit. HRA allows doctors to target specific abnormal areas with precision, which can lead to better outcomes and fewer complications.^[5][7]

Topical medications are another treatment option. These are creams or gels that patients apply to the affected area at home. Imiquimod is an immune-boosting cream that helps the body’s own immune system attack abnormal cells and HPV-infected cells. 5-fluorouracil (also called 5-FU) is a chemotherapy cream that stops abnormal cells from growing and dividing. Trichloroacetic acid is a strong acid that burns away warts and abnormal tissue when applied by a healthcare provider in the office.^[13][15]

Topical treatments have advantages and disadvantages. They work well for treating widespread or multiple areas of dysplasia that would be difficult to remove surgically. Patients can apply some of these medications at home without needing office visits. However, these treatments require a long course of use—sometimes several weeks or months—and they cause side effects like inflammation, burning, itching, and pain in the treated area. Success depends on patients being able to stick with the treatment despite the discomfort.^[15]

The duration of treatment varies widely. Surgical procedures are usually one-time events, though patients need follow-up visits to make sure the dysplasia hasn’t returned. Ablation treatments may require several sessions spaced weeks apart to treat all abnormal areas. Topical medications typically need to be used for several weeks to several months. After initial treatment, most patients need ongoing monitoring because dysplasia can come back, especially in people with weakened immune systems or ongoing HPV infection.^[7]

Common side effects of treatment include pain, bleeding, discharge, and swelling in the treated area. After ablation or surgery, patients may experience discomfort during bowel movements for a few days. Some people develop infection at the treatment site, though this is uncommon. More serious complications like anal stenosis (narrowing) or incontinence (loss of bowel control) can occur if large areas are treated, but these are rare when treatment is done by experienced specialists. Topical treatments cause skin irritation and inflammation that can be quite uncomfortable but usually resolve once treatment is finished.^[7][15]

Promising Treatments Being Studied in Clinical Trials

While standard treatments for anogenital dysplasia are effective for many patients, researchers continue to explore new approaches that might work better or cause fewer side effects. Clinical trials are research studies that test new treatments in people to see if they are safe and effective. These trials progress through different phases, each designed to answer specific questions about a new treatment.

Phase I trials focus primarily on safety. Researchers want to know what dose of a new medication is safe to use and what side effects it causes. Phase I trials typically involve small groups of people. Phase II trials test whether the new treatment actually works—does it shrink or eliminate dysplasia? These trials involve more participants and provide early evidence of effectiveness. Phase III trials compare the new treatment directly to current standard treatments to see if it works as well or better. Phase III trials involve large numbers of patients and can take several years to complete.^[15]

One area of active research involves improving topical therapies. Scientists are studying new formulations of existing medications like imiquimod and 5-fluorouracil that might be easier to use or cause fewer side effects. They’re also testing different dosing schedules to find the right balance between effectiveness and tolerability. Some trials are combining topical medications with ablation procedures to see if this combination approach leads to better long-term results.^[15]

Another promising area of research focuses on boosting the immune system’s ability to fight HPV infection and dysplasia. Some clinical trials are testing therapeutic vaccines—different from the preventive HPV vaccine—that are designed to help the body’s immune system recognize and destroy cells infected with HPV. These vaccines work by training immune cells to target specific proteins found in HPV-infected cells. Early research suggests this approach could help people with persistent dysplasia that hasn’t responded to standard treatments, though more studies are needed.^[15]

Researchers are also investigating new techniques for removing abnormal cells more precisely with less damage to surrounding healthy tissue. Some studies are testing different types of lasers, including CO2 lasers, that can vaporize dysplastic tissue with great accuracy. The advantage of laser treatment is that it may cause less scarring and faster healing compared to traditional surgical methods. However, laser treatment requires specialized equipment and training, so it’s not yet widely available.^[15]

Clinical trials for anogenital dysplasia are being conducted at medical centers across the United States, Europe, and other regions. Eligibility for trials depends on many factors, including the type and grade of dysplasia, previous treatments, overall health, immune status, and whether the person has HIV infection. Some trials specifically focus on people with HIV because they are at highest risk for dysplasia and cancer, while other trials are open to anyone with high-grade dysplasia regardless of HIV status.^[15]

Patients interested in participating in clinical trials should discuss this option with their healthcare provider. The doctor can help determine if there are appropriate trials available and whether the patient meets the eligibility requirements. Participating in a clinical trial gives people access to new treatments that aren’t yet available to the general public, and it contributes to medical knowledge that could help future patients. However, clinical trials also involve unknowns—the new treatment might not work, or it might cause unexpected side effects.

Most common treatment methods

• Active Surveillance (Watchful Waiting)
  • Used for low-grade dysplasia that often goes away on its own without treatment
  • Involves regular check-ups and screening tests every few months
  • Recommended by medical guidelines for lesions that look only slightly abnormal
• Surgical Excision
  • Surgical removal of areas with abnormal cells
  • Removed tissue is examined under a microscope to confirm the diagnosis
  • Works well for small, isolated areas of high-grade dysplasia
  • Can cause complications like stenosis or incontinence if large areas are removed
• Ablation Procedures
  • Hyfrecation or electrocautery uses electrical heat to burn away abnormal tissue
  • Infrared coagulation uses high-heat infrared light to destroy cells
  • Cryotherapy freezes abnormal tissue causing it to die and fall off
  • Usually performed in office with local anesthesia
  • Patients typically go home the same day
• High-Resolution Anoscopy (HRA)
  • Specialized technique for examining and treating anal dysplasia
  • Uses an anoscope (thin tube) inserted into the anus and a colposcope (magnifying microscope) outside the body
  • Liquid stains help identify abnormal cells
  • Allows doctors to target specific abnormal areas with precision
  • Can include biopsy to examine tissue in the laboratory
• Topical Medications
  • Imiquimod cream boosts the immune system to attack abnormal cells and HPV
  • 5-fluorouracil (5-FU) chemotherapy cream stops abnormal cells from growing
  • Trichloroacetic acid is a strong acid that burns away abnormal tissue when applied by healthcare provider
  • Good for treating widespread or multiple areas of dysplasia
  • Require long treatment courses of several weeks to months
  • Cause side effects including inflammation, burning, itching, and pain
• Laser Treatment
  • CO2 lasers vaporize dysplastic tissue with high accuracy
  • May cause less scarring and faster healing than traditional surgery
  • Requires specialized equipment and trained providers
  • Being studied in clinical trials for effectiveness