Molluscum contagiosum: the pearly bumps that take their time
Last updated September 3, 2026.
Molluscum contagiosum is a viral skin infection that produces small, firm, pearly bumps with a central dimple, most common in children, and it is one of the few skin conditions where the standard advice is to leave it alone. The bumps are harmless, they spread easily, and they resolve on their own, though the timeline tests every parent's patience: months to two years.
What do the bumps look like?
Small (2-5mm), firm, dome-shaped, flesh-colored or pearly white bumps with a characteristic central dimple (umbilication). They appear in clusters, most often on the trunk, armpits, behind the knees, and in skin folds; in children, they can appear almost anywhere except the palms and soles. The bumps are painless and usually not itchy, though the skin around them can become inflamed or eczematous (molluscum dermatitis), which does itch.
How does it spread?
By direct skin-to-skin contact, through shared towels and baths, and by scratching (which auto-inoculates the virus to new sites on the same child). It is caused by a poxvirus. Children with eczema are particularly susceptible because their skin barrier is already broken. In adults, molluscum in the genital area is considered sexually transmitted and warrants a sexual health review.
What actually helps?
- Usually nothing: most cases need no treatment. The immune system clears the virus on its own, typically within 6-18 months, occasionally up to two years.
- Do not squeeze: squeezing or picking spreads the virus and can scar; the central core is not a head that needs expressing.
- Containment: cover clusters with clothing or a waterproof plaster during shared activities (swimming, contact sports); no shared towels or baths.
- Manage the itch: if molluscum dermatitis develops around the bumps, emollients and a mild topical steroid settle it and reduce scratching-spread.
- When treatment is considered: for persistent, spreading, or cosmetically distressing cases, a dermatologist may freeze, scrape, or apply topical agents; these are options, not requirements.
When is it an emergency?
Molluscum never is. But see a doctor if the bumps become red, swollen, and painful (secondary bacterial infection), if they appear in the genital area in an adult (sexual health review), if they are extensive in someone with a weakened immune system, or if you are simply not sure they are molluscum. Pymander's escalation routing is built and tested specifically for this class of decision; see the safety architecture working paper.
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Common questions
How long does molluscum last?
The typical timeline is 6-18 months, but up to two years is normal. Individual bumps last a few weeks to a couple of months; the problem is that new ones keep appearing as old ones resolve, so the condition seems endless. The end comes when the immune system recognizes the virus; the final phase often involves the bumps going red and inflamed before disappearing, which looks worse but actually means clearance is under way.
Should my child stay off school or swimming?
No for school: molluscum is not a reason for school exclusion. For swimming, cover visible clusters with a waterproof plaster; the virus spreads in pool water and through shared towels, so coverage plus a personal towel is the practical compromise. For contact sports, cover what you can. Total social isolation for months is disproportionate to a harmless virus that most children have had by age 10.
Why do doctors say not to treat it?
Because the treatments (freezing, scraping, topical acids) hurt, can scar, and do not speed up clearance enough to justify the distress in most children. The condition is benign and self-limiting; the treatment is often worse than the disease. The exceptions are cosmetically distressing or persistent facial lesions, genital lesions in adults, and extensive molluscum in immunocompromised patients, where specialist treatment is reasonable.
Is molluscum an STI?
In adults, when the bumps are in the genital area, yes, it is considered sexually transmitted and warrants a sexual health review. In children, it is a routine childhood skin infection with no sexual connotation, spread by ordinary skin contact, shared baths, and towels. Finding molluscum on a child's trunk or limbs is completely normal. Molluscum in the genital area of a child is usually also innocent (auto-inoculation from elsewhere), but it does warrant a medical review to be thorough.
Can molluscum come back after it clears?
Once the immune system clears the virus, you are immune to that strain, and recurrence is uncommon. However, children in the same household can pass it back and forth before both have cleared it, which makes it seem to come back. New infections in adulthood are possible but rare in people with healthy immune systems. Extensive or recurrent molluscum in an adult should prompt a check of immune function.
My child has eczema and molluscum. Is that a problem?
It is a common and frustrating combination. Eczema breaks the skin barrier, making molluscum more likely to take hold and spread, and the virus triggers inflammation around the bumps (molluscum dermatitis), which worsens the eczema. Managing both together matters: regular emollients to repair the barrier, a mild topical steroid for the inflamed patches, and strict no-scratching rules. The molluscum will eventually clear; the eczema needs ongoing management.