Molluscum Contagiosum: Symptoms, Causes, and Effective Treatment in the UK

Molluscum contagiosum is a viral skin infection that results in small, firm, raised bumps (mollusca) on the skin. While it is very common in children, it can also affect adults, particularly as a sexually transmitted infection (STI). The virus belongs to the poxvirus family and thrives in warm, moist environments.

In the UK, it is often seen at sexual health clinics when the bumps appear on the groin, thighs, or genitals. Although the appearance of the lesions can be distressing, the condition is benign, meaning it is not cancerous and generally does not cause long-term health complications. However, because it is highly contagious, understanding how to manage and treat it is essential for preventing spread to others.

The main symptom of molluscum contagiosum is the appearance of small, pearly papules on the skin. These bumps typically have several distinct characteristics:

• Size: Usually small, ranging from 2mm to 5mm (about the size of a pinhead or a pencil eraser).
• Shape: Firm, dome-shaped clusters with a characteristic tiny dimple or 'umbilication' in the centre.
• Colour: Usually flesh-coloured, white, or slightly pink.
• Texture: Smooth and waxy, but they may contain a thick, white, cheesy substance.

The bumps are usually painless, but they can become itchy, red, or inflamed. If they become irritated or are scratched, they may bleed or develop a secondary bacterial infection. In adults, common sites include the lower abdomen, upper thighs, buttocks, and genital region, though they can appear anywhere except the palms of the hands and soles of the feet.

The infection is caused by the Molluscum contagiosum virus (MCV). It spreads through direct skin-to-skin contact or by touching contaminated objects (fomites). In adults, the most common modes of transmission include:

• Sexual Contact: This is the primary route for adults. If the bumps are located in the genital or pubic region, it is classified as a sexually transmitted infection.
• Fomite Spread: Sharing personal items such as towels, flannels, razors, or gym equipment can transfer the virus from one person to another.
• Autoinoculation: Scratching or picking at an existing bump can spread the virus to other parts of your own body.

It is worth noting that the virus remains only on the surface of the skin and does not enter the bloodstream. You remain infectious as long as the bumps are visible on the skin.

In most cases, a healthcare professional can diagnose molluscum contagiosum simply by examining the skin. The central dimple is a hallmark sign that distinguishes it from other conditions like warts or skin tags. In rare cases, a skin scraping or biopsy may be taken to confirm the diagnosis under a microscope.

If you have bumps in the genital area, it is highly recommended to visit a sexual health clinic for a full STI screening. It is possible to have more than one infection simultaneously, and the presence of molluscum can sometimes coincide with other STIs like chlamydia or genital herpes. In the UK, sexual health services are confidential and often provide specialised advice on managing the virus alongside other aspects of sexual well-being.

For many healthy adults, treatment is not strictly necessary because the immune system will eventually clear the virus. This process can take anywhere from 6 to 18 months, though individual bumps usually resolve within a few weeks. However, treatment may be sought for cosmetic reasons, to reduce the risk of transmission, or if the bumps are causing significant itching.

UK treatment options include:

• Topical Treatments: Creams or liquids containing substances like potassium hydroxide (over-the-counter) or podophyllotoxin (prescription) may be used to irritate the spots and trigger an immune response.
• Cryotherapy: Freezing the bumps with liquid nitrogen. This is usually performed by a GP or at a specialist clinic and may require multiple sessions.
• Curettage: Scraping the bumps away under local anaesthetic.
• Laser Therapy: Less common, but sometimes used for extensive or persistent cases.

Squeezing or 'popping' the bumps at home is strongly discouraged, as this can lead to scarring and further spread of the infection.

While molluscum contagiosum is often self-limiting, consulting a healthcare professional is beneficial for several reasons. You should consider booking a consultation if:

• The bumps are spreading rapidly or appearing on the face.
• The lesions are becoming painful, red, or discharging pus (signs of a secondary infection).
• You are unsure of the diagnosis and want to rule out other skin conditions or STIs.
• The condition is causing you significant psychological distress or affecting your self-esteem.
• You have a weakened immune system (e.g., due to medication or underlying health conditions), as the virus can be more extensive and harder to treat in these cases.

An online GP can review pictures of the affected area, provide an initial assessment, and advise on the most appropriate topical treatments or refer you to a specialist clinic if necessary.

Preventing the spread of molluscum contagiosum involves both protecting others and preventing the virus from moving to other parts of your own body. Following these steps can help:

• Avoid scratching: Picking at the bumps releases the virus and increases the risk of scarring.
• Keep it covered: If you are in close contact with others, cover the affected areas with clothing or a light waterproof bandage.
• Hand hygiene: Wash your hands thoroughly after touching affected skin.
• Personal items: Do not share towels, razors, or sponges with others.
• Safer sex: If the spots are in the genital area, it is best to avoid sexual contact until the bumps have completely cleared. Condoms may not offer full protection as the virus can be on skin not covered by the condom.