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Molluscum contagiosum

Definition

Molluscum contagiosum is a viral skin infection that causes raised, pearl-like or on the skin.

Causes

Molluscum contagiosum is caused by a virus that is a member of the poxvirus family. You can get the infection in different ways.

This is a common infection in children and occurs when a child comes into direct contact with a skin lesion or an object that has the virus on it. (A skin lesion is an abnormal area of skin.) The infection is most often seen on the face, neck, armpit, arms, and hands. However, it can occur anywhere on the body, except it is rarely seen on the palms and soles.

The virus can spread through contact with contaminated objects, such as towels, clothing, or toys.

The virus also spreads by sexual contact. Early lesions on the genitals may be mistaken for or . Unlike herpes, these lesions are painless.

People with a weakened immune system (due to conditions such as ) or severe eczema may have a rapidly spreading case of molluscum contagiosum.

Symptoms

The infection on the skin begins as a small, painless papule, or bump. It may become raised to a pearly, flesh-colored nodule. The papule often has a dimple in the center. Scratching or other irritation causes the virus to spread in a line or in groups, called crops.

The papules are about 2 to 5 millimeters wide. Usually, there is no inflammation (swelling and redness) and no redness unless they have been irritated by rubbing or scratching.

In adults, the lesions are commonly seen on the genitals, abdomen, and inner thigh.

Exams and Tests

Your health care provider will examine your skin and ask about your symptoms. Diagnosis is based on the appearance of the lesion.

If needed, the diagnosis can be confirmed by removing one of the lesions to check for the virus under a microscope.

Treatment

In people with a healthy immune system, the disorder usually goes away on its own over months to years. But the lesions can spread before they go away. Although it's not necessary for a child to be treated, schools or daycare centers may ask parents that the child be treated to prevent spread to other children.

Individual lesions may be removed with minor surgery. This is done by scraping, de-coring, freezing, or through needle electrosurgery. Laser treatment may also be used. Surgical removal of individual lesions may sometimes result in scarring.

Medicines, such as salicylic acid preparations used to remove warts, may be helpful. Cantharidin is the most common solution used to treat the lesions in the provider's office. Tretinoin cream or imiquimod cream may also be prescribed.

Outlook (Prognosis)

Molluscum contagiosum lesions may persist from a few months to a few years. They eventually disappear without scarring, unless there has been excessive scratching, which may leave scars or discoloration.

The disorder may persist in people with a .

Possible Complications

Problems that can occur include any of the following:

  • Persistence, spread, or recurrence of lesions
  • Secondary bacterial skin infections (rare)

    • When to Contact a Medical Professional

    Call for an appointment with your provider if:

  • You have a skin problem that looks like molluscum contagiosum
  • Molluscum contagiosum lesions persist or spread, or if new symptoms appear 

    • Prevention

    Avoid direct contact with the skin lesions of people who have molluscum contagiosum. Do not share towels or other personal items, such as razors and make-up, with other people.

    Male and female condoms can't fully protect you from getting molluscum contagiosum from a partner, as the virus can be on areas not covered by the condom. Even so, condoms should still be used every time the disease status of a sexual partner is unknown. Condoms reduce your chances of getting or spreading molluscum contagiosum and other STDs.

    References

    Guzman AK, Cohen SR. Molluscum contagiosum. In: Lebwohl MG, Heymann WR, Coulson IH, Murrell DF, eds. Treatment of Skin Disease: Comprehensive Therapeutic Strategies. 6th ed. Philadelphia, PA: Elsevier; 2022:chap 156.

    James WD, Elston DM, Treat JR, Rosenbach MA, Neuhaus IM. Viral diseases. In: James WD, Elston DM, Treat JR, Rosenbach MA, Neuhaus IM, eds. Andrews' Diseases of the Skin: Clinical Dermatology. 13th ed. Philadelphia, PA: Elsevier; 2020:chap 19.

    Patterson JW. Viral diseases. In: Patterson JW, ed. Weedon's Skin Pathology. 5th ed. Philadelphia, PA: Elsevier Limited; 2021:chap 27.

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    Review Date: 5/31/2023

    Reviewed By: Ramin Fathi, MD, FAAD, Director, Phoenix Surgical Dermatology Group, Phoenix, AZ. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.