Is molluscum contagiosum an STI?

Molluscum contagiosum – behind this medical term lies a widespread but often underestimated skin infection that causes small, wart-like bumps.
Especially when it occurs in the genital area, the condition raises many questions: Is it a sexually transmitted infection (STI)? How contagious is it? And how should one deal with it?

In this blog article, you will learn exactly what molluscum contagiosum is, how it is transmitted, whether it is classified as an STI, and what treatment options exist.

Table of contents

• What is molluscum contagiosum?
• What symptoms does molluscum contagiosum cause?
• Is molluscum contagiosum an STI?
• How is molluscum contagiosum transmitted?
• How is molluscum contagiosum treated?
• How can you protect yourself?
• When should you see a doctor?

What is molluscum contagiosum?

Molluscum contagiosum is a contagious viral skin infection caused by the molluscum contagiosum virus (MCV), which belongs to the poxvirus family (Poxviridae). It presents as small, rounded skin lesions known as papules, which typically appear in areas of direct skin contact. The virus only infects the uppermost layers of the skin and, despite its noticeable appearance, is usually harmless from a medical perspective. In most cases, the condition resolves on its own within 6 to 12 months without leaving scars (CDC, 2025).

What symptoms does molluscum contagiosum cause?

Diagnosis is usually based on the characteristic appearance of the bumps. These are:

• skin-colored to whitish

• smooth, round, and slightly raised

• with a small central indentation

• about 2 to 5 millimeters in diameter

Typically, the papules appear in clusters. Some individuals report mild itching. In rare cases, inflammation may occur due to friction or manipulation.

A possible progression includes:

The location of the papules depends on age and mode of transmission. In adults, they often appear in the genital area, lower abdomen, and thighs. In children, the papules typically affect the arms, torso, face, or backs of the knees (Mayo Clinic, 2024).

Is molluscum contagiosum an STI?

Molluscum contagiosum is not fundamentally classified as a sexually transmitted infection (STI). It is a skin infection that spreads through direct skin contact – even outside of sexual activity. However, sexual contact plays a significant role in its transmission among adults (Cleveland Clinic, 2023).

Molluscum contagiosum may be considered an STI when:

• transmission occurs via sexual contact

• lesions appear in the intimate or genital area

• sexual activity is the only plausible source of transmission

In adults, papules in the genital area are often a sign of sexually transmitted infection – even though molluscum contagiosum itself is not exclusively spread through sex.

Important to know: Condoms do not provide complete protection, as the virus can spread via skin areas not covered by the condom. Still, condom use significantly reduces the risk of transmission.

How is molluscum contagiosum transmitted?

The virus spreads through direct skin-to-skin contact – whether during sports, play, or sexual activity. Shared items like towels, clothing, or razors can also contribute to transmission.

Common transmission routes include:

• direct contact with infected skin

• sexual contact (especially in adults)

• shared use of towels, washcloths, or gym equipment

• micro-lesions of the skin, e.g., from shaving

Source: CDC, 2025

How is molluscum contagiosum treated?

In most cases, the infection heals on its own within 6 to 12 months. Treatment is not medically required but may be considered for cosmetic or hygiene reasons. Possible treatment methods include:

• Curettage: mechanical removal of papules by scraping

• Cryotherapy: freezing of affected areas with liquid nitrogen

• Topical medications: such as potassium hydroxide or imiquimod

Important: Squeezing or scratching the papules can promote spread and should be avoided (Cleveland Clinic, 2023).

How can you protect yourself?

Complete protection is not always possible due to the high risk of contagion. However, the following measures help reduce the risk:

• Avoid close skin contact with infected individuals

• Use only your own towels, razors, and clothing

• Refrain from sexual contact when visible lesions are present

• Use condoms – although not fully protective, they reduce the risk

• Support your immune system with a healthy lifestyle

Note for parents: In children, infection often occurs through skin contact during play. Make sure towels and clothes are not shared and discourage scratching to prevent further spread.

Source: NHS, 2022

When should you see a doctor?

It is advisable to consult a doctor if:

• papules appear in the genital area and the cause is unclear

• there is rapid spread or signs of inflammation

• you have a weakened immune system

• the infection causes psychological distress

Since molluscum contagiosum in the genital area can be confused with other STIs like herpes or HPV (genital warts), a proper diagnosis is recommended if in doubt.
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