Anal Genital Warts: Causes, Treatment & Prevention

Anal genital warts are small, skin-coloured growths that develop around the anus and genitals, caused by the human papillomavirus (HPV) — one of the most common sexually transmitted infections in Canada. These warts spread through direct sexual contact, including vaginal, anal, and sometimes oral sex, and can appear on people of any age or gender.

What Are Anal Genital Warts and What Causes Them?

Understanding the causes, symptoms, and HPV warts treatment options available in Canada is essential for protecting your health. Whether you are newly diagnosed or looking for prevention strategies like the HPV vaccine, this guide covers everything Canadians need to know — from topical therapies and cryotherapy to surgical removal and how to reduce your risk of reinfection.

What Are Anal Genital Warts?

Treatment Options for Anal Genital Warts: A Comparison Guide

Treatment Option	How It Works	Benefits	Considerations
Imiquimod Cream (Aldara)	Topical immunotherapy that stimulates the body’s immune response to destroy wart tissue	Self-applied at home; effective for external warts; lower recurrence rates	Requires consistent application 3x per week; may cause local skin irritation; available by prescription in Canada
Cryotherapy (Liquid Nitrogen)	Freezes and destroys wart tissue using liquid nitrogen applied by a healthcare provider	Quick in-office procedure; no anaesthesia required; widely available at Canadian STI clinics	Multiple sessions often needed; can cause temporary pain, blistering, and skin discolouration
Trichloroacetic Acid (TCA)	Chemical solution applied directly to warts that destroys tissue through chemical burning	Effective for small, isolated warts; safe during pregnancy; low cost	Must be applied by a clinician; risk of burning surrounding healthy tissue; multiple visits required
Surgical Excision or Electrocautery	Physical removal or burning of wart tissue under local anaesthesia	Immediate removal of large or widespread warts; high single-session clearance rate	Performed in a clinical setting; risk of scarring; post-procedure recovery time needed
Podophyllotoxin (Condyline)	Plant-derived antimitotic agent that destroys wart cell growth when applied topically	Patient self-administered; effective for external genital and anal warts	Not recommended during pregnancy; can cause local irritation; requires 4-week treatment cycles

Anal genital warts, also called condyloma acuminata, are small warts that grow on or around the genitals and anus. They range in colour from pink to white. In some cases, they can appear inside the anal canal or on the skin of the upper thighs.

These warts are not the same as warts you might get on your hands or feet. Different strains of HPV cause those. The strains that cause anal genital warts spread through direct sexual contact — including vaginal, anal, and sometimes oral sex.

According to Health Canada, HPV is extremely common. Most sexually active people will have some form of HPV at some point in their lives. However, not everyone who carries the virus will develop warts.

Types of Genital Warts: Understanding the Difference

There are two main types of venereal warts that doctors identify. It is important to know the difference, because they have different causes and treatments.

Condyloma Acuminata (HPV Warts)

These are the most common type of anal genital warts. They are soft, flesh-coloured, and appear in clusters that can look like a small cauliflower. They develop as a result of an HPV infection. Warts can appear on the penis, vagina, vulva, anus, and rarely inside the mouth.

Furthermore, these warts can take weeks or even months to appear after contact with an infected person. About two-thirds of people who have sexual contact with an infected partner will develop warts within three months.

Condyloma Lata (Syphilis-Related Warts)

Condyloma lata are flat, moist, reddish growths. They are not caused by HPV. Instead, they are a sign of secondary syphilis, a bacterial infection. Doctors treat these with antibiotics, following a standard syphilis treatment plan. If you notice flat, moist sores in the genital area, see a doctor right away.

How Do Anal Genital Warts Spread?

Anal genital warts spread mainly through skin-to-skin sexual contact. You do not need to have penetrative sex to pass HPV to a partner. Touching an infected area is enough to transmit the virus.

In addition, HPV can spread through shared sex toys or intimate objects that have already touched an infected person. Therefore, cleaning and covering shared items is an important safety step. The virus can also be present even when no warts are visible, which makes it easy to spread without knowing.

As a result, many people unknowingly pass HPV to their partners. This is why regular STI testing is so important, even if you feel completely healthy. You can read more about HPV transmission on the World Health Organization’s HPV fact sheet.

Symptoms of Anal Genital Warts

Many people with HPV have no symptoms at all. However, when anal genital warts do appear, you may notice the following:

• Small, flesh-coloured or pinkish bumps near the anus or genitals
• Clusters of growths that look like a cauliflower
• Itching, discomfort, or mild bleeding around the anal area
• A feeling of moisture or dampness in the anal region
• Warts that are flat and difficult to see with the naked eye

Sometimes the warts are so small that they are hard to notice on your own. A doctor or nurse practitioner can examine the area and confirm whether warts are present. Do not try to diagnose yourself at home.

Treatment Options for Anal Genital Warts

There is no cure for HPV itself. However, doctors can remove or destroy the warts that HPV causes. Treatment focuses on clearing visible warts and reducing discomfort. Your doctor will recommend the best option based on the size, number, and location of the warts.

Topical Treatments

Some treatments come as creams or solutions that you apply directly to the warts. These work by destroying the wart tissue or by stimulating your immune system to fight the virus. A doctor must prescribe most of these treatments. Do not use over-the-counter wart removers meant for hands or feet on genital warts — they can cause serious skin damage.

Immune-Boosting Therapies

One option involves injecting a substance called interferon alfa directly into the wart. This stimulates your immune system to attack and destroy the wart tissue. However, interferon alfa is quite costly. It also does not work for everyone. Your doctor will discuss whether this approach makes sense for your situation.

Cryotherapy (Freezing)

Cryotherapy uses liquid nitrogen to freeze and destroy wart tissue. A healthcare provider applies the liquid nitrogen directly to the wart. The frozen tissue dies and falls off over time. This is a common, effective, and relatively quick procedure done in a clinic setting.

Chemical Cauterization

Doctors can also use acidic chemical compounds to chemically burn away warts. These compounds destroy the wart tissue layer by layer. This method is typically performed in a clinic and may require more than one visit to fully clear the warts.

Surgical and Laser Removal

For larger or more stubborn anal genital warts, surgical removal may be necessary. Doctors can remove warts using electrocauterization (burning with an electric current) or CO2 laser vaporization. These procedures take place in a hospital or surgical centre with the proper equipment.

It is important to understand that even after successful removal, warts can come back. The HPV virus can remain dormant in your body’s tissues. New warts may appear up to 30 days after a seemingly successful treatment. This is why follow-up care is essential.

For a comprehensive overview of treatment approaches, visit the Mayo Clinic’s guide to genital warts treatment.

How to Prevent Anal Genital Warts

Prevention is the most effective way to protect yourself from anal genital warts. Several steps can significantly lower your risk of getting or spreading HPV.

Get Vaccinated

Canada offers HPV vaccines through provincial and territorial school-based immunisation programmes. The vaccine protects against the HPV strains most likely to cause genital warts and cervical cancer. It is most effective when given before a person becomes sexually active. However, it can still offer protection in older adults. Check with your provincial health plan or family doctor to find out if the vaccine is covered for you.

Use Condoms

Condoms do not provide complete protection against HPV, because the virus can live on skin not covered by a condom. However, using condoms consistently and correctly does significantly reduce your risk. It also protects against many other STIs.

Limit Sexual Partners

Limiting your number of sexual partners reduces your chance of coming into contact with HPV. Being in a mutually monogamous relationship — where both partners are tested and faithful — lowers your risk further. However, remember that HPV can be present without symptoms. Testing is still important.

Get Tested Regularly

Both you and your partner should get tested for HPV and other STIs regularly, even if neither of you has symptoms. Many Canadian walk-in clinics and sexual health centres offer confidential STI testing. Your provincial health plan typically covers STI testing when ordered by a doctor or nurse practitioner. Early detection makes treatment easier and helps prevent the virus from spreading further.

Avoid Sharing Intimate Items

Do not share sex toys or other intimate objects without properly cleaning and covering them first. HPV particles can survive on surfaces and transfer to a new person. Using a fresh condom over a shared toy each time is a simple protective measure.

When to See a Doctor

You should see a doctor if you notice any unusual bumps, lumps, or growths around your genitals or anus. Do not wait to see if they go away on their own. Early treatment is more effective and reduces the chance of spreading the infection to others.

In Canada, you have several options for getting care. Your family doctor is always a great first point of contact. If you do not have a family doctor, a walk-in clinic or a sexual health centre can assess you without an appointment. Many provinces also offer telehealth services, so you can speak with a nurse or doctor from home.

You should also see a doctor if:

• Warts return after treatment
• You experience pain, bleeding, or discharge from the anal area
• Your partner has been diagnosed with HPV or genital warts
• You are pregnant, as HPV can sometimes affect the baby
• You are unsure whether what you see is a wart or something else

Always consult a qualified healthcare provider for a proper diagnosis and treatment plan. This article provides general information only and is not a substitute for professional medical advice.

Frequently Asked Questions About Anal Genital Warts

Key Takeaways

• Anal genital warts are caused by certain strains of the human papillomavirus (HPV), a very common STI in Canada.
• They spread through skin-to-skin sexual contact and can appear even when no warts are visible.
• Treatment options include cryotherapy, chemical treatments, immune therapies, and surgical removal.
• Warts can return after treatment because HPV can stay dormant in the body. Long-term follow-up is important.
• The HPV vaccine, available through provincial school programmes, is one of the best ways to prevent genital warts.
• Using condoms, getting tested regularly, and limiting sexual partners all help reduce your risk.
• If you notice any unusual growths around your genitals or anus, see your family doctor, visit a walk-in clinic, or contact a sexual health centre as soon as possible.