Molluscum contagiosum isn't strictly an STD, but in adults it's often spread through sex, which is why it's frequently grouped with STIs. It's a benign skin infection caused by a poxvirus that passes through direct skin-to-skin contact, contaminated objects, or self-spread from scratching. In children it's a common, non-sexual skin condition; in adults, genital lesions usually point to sexual transmission CDC.
with the right treatment
testing, not symptoms, decides
| Item | Value |
|---|---|
| Curable? | yes — with the right treatment |
| If you may have it | get tested — testing, not symptoms, decides |
That dual identity trips people up. The same virus behaves like a routine childhood skin bug on one body and like a sexually transmitted infection on another, depending on where it lands and how it got there. Below is how molluscum moves between people, what it does not do, and what to do if you think you've been exposed.
How molluscum contagiosum spreads
Molluscum is caused by the molluscum contagiosum virus, a poxvirus that infects the top layers of skin and produces the small, firm, often dimpled bumps people recognize. The virus lives in those lesions, so transmission happens whenever virus-containing skin or material reaches someone else's skin. There are three main routes, and they overlap more than you'd think.
Direct skin-to-skin contact (including sex)
Most often the virus moves through plain physical contact with the bumps on an infected person. In kids that's wrestling, sharing close quarters, or general roughhousing. In adults, that same contact during sex is why genital, lower-abdomen, inner-thigh, and groin lesions are classed as sexually transmitted CDC clinical. No cut or break in the skin is needed. The virus enters through normal contact with intact skin against an active lesion.
Contaminated objects (fomites)
The virus can hitch a ride on items that touch infected skin. Sharing towels, clothing, washcloths, or pool and gym equipment can carry it from one person to the next. This route worries parents and athletes most, and it does happen, though the object has to have had real contact with the bumps, not just be in the same room.
Autoinoculation (spreading it to yourself)
Once you have molluscum, you can spread it across your own body. Touching, scratching, picking, or shaving over the bumps drags virus to new skin and seeds fresh lesions. This is autoinoculation. Shaving over a lesion turns a few bumps into a whole cluster along a razor's path, which is why covering them and leaving them alone is core advice. You can read more about what these lesions look like and where they appear in our guide to molluscum contagiosum bumps.
How molluscum is NOT transmitted
A lot of worry here is misplaced. Molluscum needs contact with the virus in an active lesion or with something that just touched one. It doesn't float through the air or linger on every surface you fear. You don't catch it from:
- Toilet seats or other casual surfaces you brush against in passing.
- Being in the same room, sharing a meal, or having a normal conversation with someone who has it.
- Saliva alone — a kiss on the cheek or sharing a glass isn't a recognized route the way direct contact with a lesion is.
- Air or droplets, the way a cold or flu spreads. Molluscum is a contact infection, not a respiratory one.
- Clean, freshly laundered shared spaces or equipment that hasn't touched an active lesion.
The danger is the bumps themselves and what directly touches them, not the building, the bathroom, or the conversation.
Who's at higher risk
Molluscum can affect anyone, but a few groups carry most of the burden. Young children get it from ordinary close skin contact and shared toys or towels. Sexually active adults pick up the genital form through partner contact. Athletes in contact sports and people who use shared pools, mats, or locker rooms face fomite exposure. People with weakened immune systems — including those with poorly controlled HIV or on immune-suppressing medication — tend to get more numerous, larger, and harder-to-clear lesions, because the immune system is what normally keeps the virus in check and eventually clears it.
Reducing the risk
Prevention is mostly about controlling contact with the bumps. If you have molluscum, keep the lesions covered with clothing or a bandage so they can't rub against others or contaminate shared items, wash your hands often, and don't share towels or clothing. Leave the bumps alone — no scratching, picking, or shaving over them — to keep from spreading them across your own skin.
For the sexually transmitted form, the same tools that work for other STIs help here. Condoms used every time lower the risk of passing the virus during sex, though they only protect the skin they actually cover, so lesions outside the covered area can still spread. Because molluscum often sits alongside other infections that have no symptoms, routine screening matters too — see what regular get tested visits can catch. The table below sorts what helps from what doesn't.
| Situation | Does it help prevent spread? | Why |
|---|---|---|
| Covering bumps with clothing or a bandage | Yes | Blocks direct contact and stops virus reaching others or objects |
| Condoms during sex | Partially | Protect covered skin; lesions outside that area can still spread |
| Not sharing towels or razors | Yes | Removes the fomite and autoinoculation routes |
| Not scratching or shaving over bumps | Yes | Prevents self-spread to new skin |
| Avoiding toilet seats / casual surfaces | No real benefit | These aren't meaningful transmission routes |
If you think you've been exposed
Molluscum has no instant test. It's usually identified by the appearance of the bumps once they show up, which can take weeks. If your exposure involved a sexual partner, confirm timing for any co-occurring STIs so you screen when results will be accurate; here's when to test after exposure.
When to see a clinician
Many cases of molluscum clear on their own once the immune system catches up, but you should see a clinician if the bumps are spreading, appear on or near the genitals, are getting irritated or infected, or if you're not sure what they are. A clinician can confirm the diagnosis, rule out look-alikes, and discuss whether to treat — options range from leaving them alone to active removal, covered in our guide to molluscum contagiosum treatment & removal options. Genital bumps in particular are worth an exam, since they're easy to confuse with other conditions; see genital warts vs herpes vs molluscum bumps for how they differ. A molluscum diagnosis is common and treatable, and clinics handle it routinely.