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Home > Skin & Beauty > Skin Conditions > Warts: Types, Risk Factors, and Medical Treatment

Warts: Types, Risk Factors, and Medical Treatment

January 5, 2021 - Updated on August 18, 2021
4 min read
By Akanksha Shah Sanghvi, MD, Clinical Dermatology

In this article:

  • Types of Warts
  • Cause of Warts
  • Medical Treatment for Warts
  • Diagnosing Warts
  • Risk Factors for Warts
  • Complications of Untreated Warts
  • When to See a Doctor
  • Final Word

Warts refer to bumps on the skin that occur due to an infection with the human papillomavirus (HPV). Also known as verrucae, this common skin problem generally develops on the hands and feet.

treating warts

Warts affect around 10% of the world population, with a prevalence of 10%–20% among school-aged children. (1)(2) While warts rarely cause any severe health problem, warts can be an aesthetic concern to many.

Types of Warts

Warts are generally seen on the hands and feet, but they can develop on any part of the body. They may develop singly or in clusters and even have different textures and colors.

characteristics of warts

Based on these characteristics, warts are classified into the following types:

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  1. Common warts: These warts are found on the toes and fingers and are dark in color.
  2. Periungual warts: These warts develop around and under the nails. They are irregularly shaped and rough.
  3. Flat warts: These warts are rounded and flat and are found on the arms, thighs, and face. They can be pink, yellowish, or light brown.
  4. Plantar warts: These warts grow in the soles of the feet.
  5. Filiform warts: These warts are elongated and appear around the nose, neck, mouth, and chin.
  6. Genital warts: These warts are present around the genital area.

Cause of Warts

HPV is a common microbe that can easily spread through direct skin contact and even through objects such as razors and towels. Almost everyone is exposed to HPV at least once in their lifetime, but warts develop only when the virus enters the skin.

There are multiple strains of HPV that can enter the skin through cuts or wounds. (3) Upon entry, the virus induces excessive cell growth that further develops as warts.

Medical Treatment for Warts

treatment options for warts

Most cases of warts resolve on their own, especially in children. However, a dermatologist may recommend the following treatments to facilitate a quicker recovery:

  • Cantharidin: The topical application of cantharidin over the wart induces blister formation under it. This helps detach the wart from the skin cells, which can then be removed by a dermatologist after about a week.
  • Electrosurgery: This procedure involves burning the wart with electricity and is commonly used for the treatment of common, foot, and filiform warts.
  • Curettage: A sharp tool is used to scrape off the wart.
  • Cryotherapy: This procedure involves freezing the wart and then excising it to minimize the pain.
  • Surgical excision: Warts can be surgically removed after giving local anesthesia. However, this may result in scarring.
  • Laser surgery: This type of surgery is ideal for hard-to-remove warts.
  • Chemical peeling: The use of salicylic or glycolic acid chemical peels is beneficial for flat warts.
  • Vitamin D injection: The doctor may give intralesional vitamin D injections to help manage the condition.

A long-term or recurrent problem of warts may require the following treatments:

  • Topical or oral retinoids
  • Oral vitamins
  • Fluorouracil cream
  • Photodynamic therapy
  • H2 receptor antagonists
  • Bleomycin injections
  • Immune therapy using topical chemicals (imiquimod) or interferon injections

Diagnosing Warts

A physical exam is done by the doctor to assess the type of warts. This includes examining the color, number, size, and texture of the wart.

Also, the doctor may order the following tests to confirm the diagnosis:

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  • Blood tests or immunohistochemical tests
  • Skin biopsy
  • Southern blot hybridization to detect the presence of virus inside the body

Risk Factors for Warts

The following factors can increase the chances of being infected by warts:

  • Suppressed or weakened immune system
  • Use of communal showers in gyms, sport arenas, and pools
  • Contact with people affected by warts
  • Skin diseases such as eczema (4)
  • Diabetes (5)
  • Daily handling of meat (6)
  • Smoking and alcohol consumption
  • White ethnicity (7)

Complications of Untreated Warts

complications of untreated warts

Although rarely, warts can contribute to the development of the following complications:

  • Cervical cancer in the case of genital warts (3)
  • Squamous tissue cancer in the case of plantar warts (8)
  • Anal, vulvar, or penile cancer

When to See a Doctor

Warts often cause pain but are generally manageable. However, you must consult a doctor if you have:

  • Plantar warts that are causing difficulty walking
  • Periungual warts that cause pain with nail growth
  • Problems in sleeping
  • Symptoms of social withdrawal
  • Bleeding around the warts
  • Increasing number of warts
  • Warts that are changing color
  • Any immunodeficiency disorder or diabetes
What you may ask your doctor
  • Can the warts recur after treatment?
  • Is surgery required to remove the warts?
  • Will the treatment have side effects?
  • Do I need to get tested for a medical condition?
What your doctor may ask you
  • When did you first notice the development of warts?
  • Have the warts grown or changed colors since?
  • Do you have an immunodeficiency disorder, skin problem, or diabetes?
  • Are the warts recurrent?

Final Word

Warts are a common skin problem and they appear as bumps on the skin due to an infection with HPV. They generally resolve on their own due to the action of the immune system.

It is suggested to keep track of the color and number of your warts and contact a doctor if you notice any changes or if the condition gets severe.

Continue Reading Continue ReadingHome Remedies for Warts and Self-Care Tips
References
  1. Moscicki A-B. Impact of HPV infection in adolescent populations. https://www.ncbi.nlm.nih.gov/pubmed/16310138. Published December 2005.
  2. Essa N, Saleh MA, Mostafa RM, Taha EA, Ismail TA. Prevalence and factors associated with warts in primary school children in Tema District, Sohag Governorate, Egypt. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6351504/. Published 2019.
  3. Braaten KP, Laufer MR. Human Papillomavirus (HPV), HPV-Related Disease, and the HPV Vaccine. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2492590/. Published 2008.
  4. NB; SJIS. Childhood atopic dermatitis and warts are associated with increased risk of infection: a US population-based study. https://pubmed.ncbi.nlm.nih.gov/24094542/. Published 2014.
  5. C; YMPKGNOM. Diabetes and genital warts: an unhappy coalition. https://pubmed.ncbi.nlm.nih.gov/20852193/. Published 2010.
  6. Konishi L, Alfredo CH, Silva-Junior JS. Hand warts among butchers in a supermarket in São Paulo. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7394538/. Published April 24, 2020.
  7. Schabath MB, Villa LL, Lin H-Y, et al. Racial differences in the incidence and clearance of human papilloma virus (HPV): the HPV in men (HIM) study. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3795913/. Published October 2013.
  8. Gordon DK; Ponder EN; Berrey BH; Kubik MJ; Sindone J; Verrucous carcinoma of the foot, not your typical plantar wart: a case study. https://pubmed.ncbi.nlm.nih.gov/24810296/. Published 2014.
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