Molluscum contagiosum is not a wart, even though the two look similar enough that people confuse them all the time. They are caused by completely different viruses, appear differently on the skin, and behave differently over time. Understanding the distinction matters because it changes what you’re dealing with and how it’s managed.
Two Different Viruses
The core reason molluscum contagiosum isn’t a wart comes down to biology. Molluscum is caused by the molluscum contagiosum virus (MCV), which belongs to the poxvirus family. Common warts are caused by human papillomavirus (HPV), a completely separate virus family. These two virus families are about as closely related as cats and fish. They just happen to produce somewhat similar-looking skin bumps.
This isn’t a minor technicality. Because the viruses work differently inside your cells, the bumps they produce have different structures, different lifespans, and different responses to treatment. Calling molluscum a wart is like calling chickenpox measles because both cause a rash.
How to Tell Them Apart by Sight
Once you know what to look for, molluscum and warts are fairly easy to distinguish. Molluscum bumps are small, pearly, and smooth, averaging 2 to 5 millimeters across. Their signature feature is a tiny dimple or pit in the center of each bump. If you squeeze one (which isn’t recommended), it releases a white, cheesy material. The bumps tend to be dome-shaped with a waxy or slightly translucent quality.
Common warts look quite different up close. They have a rough, irregular surface texture, almost like a tiny cauliflower. The skin over a wart is thickened and hardened. One telltale clue: if a wart is pared down or shaved, you’ll often see tiny black dots inside it. Those are thrombosed capillaries, small blood vessels that have clotted within the wart’s structure. Molluscum bumps never have those black dots.
Where They Show Up on the Body
Location is another useful clue. Common warts strongly favor the hands and feet. Plantar warts on the soles of the feet and warts on the fingers and around the nails are classic HPV presentations.
Molluscum can appear almost anywhere on the body, including the trunk, arms, legs, and face, but it is rarely found on the palms of the hands or the soles of the feet. In children, it commonly clusters on the torso, armpits, and inner elbows. In adults, molluscum is often sexually transmitted, so bumps may appear in the genital area, inner thighs, or lower abdomen. If you see a cluster of smooth, dimpled bumps on areas where warts would be unusual, molluscum is the more likely culprit.
How Each One Spreads
Both conditions spread through direct skin-to-skin contact, but molluscum also readily spreads through contaminated objects. Shared towels, pool equipment like kickboards, goggles, and toys can all carry the virus. There’s a longstanding belief that swimming pools themselves spread molluscum, but the CDC notes this has never actually been proven. It’s more likely the sharing of equipment and towels around the pool that does it.
You can also spread molluscum to other parts of your own body by touching or scratching existing bumps and then touching unaffected skin. This self-spreading tendency, called autoinoculation, is one reason molluscum clusters sometimes expand over weeks or months. Warts can also spread this way, but molluscum tends to do it more aggressively, especially in children who scratch.
How Long They Last
This is one of the biggest practical differences. Molluscum contagiosum is self-limiting, meaning it will eventually clear on its own without any treatment as your immune system recognizes and fights off the virus. For most people this takes somewhere between 6 and 18 months, though some cases can linger longer, particularly in people with weakened immune systems.
Common warts can also resolve on their own, but they’re far less predictable. Some disappear within a year; others persist for years. Plantar warts in particular can be stubborn, lasting well beyond the point where most people’s patience runs out.
Treatment Differences
Because molluscum often resolves without treatment, many doctors take a wait-and-watch approach, especially for children. When treatment is pursued, the options are different from wart removal. Physical removal methods like cryotherapy (freezing) or scraping can work for both conditions, but the medications used differ.
In 2024, the FDA approved the first topical prescription treatment specifically for molluscum contagiosum, a gel applied once daily to each bump for up to 12 weeks. Before this, there was no FDA-approved topical therapy for molluscum, which meant treatment often relied on in-office procedures or off-label remedies.
Warts, by contrast, have a longer history of over-the-counter treatments. Salicylic acid patches and solutions are widely available for common warts and plantar warts, and they don’t work on molluscum. This is another reason the distinction matters: buying a wart remover for molluscum won’t give you the results you’re expecting.
Why the Confusion Exists
The mix-up between molluscum and warts is understandable. Both are viral skin infections that produce raised bumps. Both are common in children. Both spread through contact. And both are generally harmless in people with healthy immune systems. Some older medical references even use the term “water warts” for molluscum, which only deepens the confusion.
But beneath those surface similarities, you’re dealing with different viruses, different bump structures, different body locations, and different treatment paths. If you’re trying to figure out which one you or your child has, the simplest visual test is the dimple: a smooth, pearly bump with a central pit points to molluscum, while a rough, irregular bump with possible black dots points to a wart.