Molluscum Contagiosum

What is molluscum contagiosum?

Molluscum contagiosum is a common, generally harmless skin infection caused by a virus. It produces small, raised, flesh-colored bumps (called papules) on the skin. The name comes from Latin: “molluscum” refers to the soft, rounded shape of the bumps, and “contagiosum” reflects the fact that the infection spreads easily from person to person or from one part of the body to another. In medical coding systems, the condition is listed under ICD-10 code B08.1.

So, what is molluscum contagiosum in everyday terms? It is a viral skin condition that mainly affects the outer layer of the skin (the epidermis). The virus does not spread through the bloodstream to internal organs in people with a healthy immune system, which is why the infection is usually limited to the skin’s surface.

The condition most often affects children between roughly one and ten years of age, because young children have close physical contact with each other and their immune systems have not yet encountered the virus. It can also affect adolescents and adults. In adults, molluscum contagiosum is often spread through close skin-to-skin contact, including sexual contact. People with weakened immune systems — for example, those living with HIV, those receiving chemotherapy, or those taking medications that suppress the immune system — may develop more numerous, larger, or more persistent bumps. People with eczema (atopic dermatitis, a condition that causes dry, itchy, inflamed skin) also tend to develop more widespread lesions, because the skin barrier is weakened and scratching spreads the virus.

Although the appearance of the bumps can be distressing, molluscum contagiosum is not dangerous for most people, and in many cases it eventually clears on its own without leaving scars.

Symptoms of molluscum contagiosum

Molluscum contagiosum symptoms are almost entirely limited to the skin. The condition does not usually cause fever, tiredness, or other general signs of illness. The main sign is the appearance of characteristic bumps, which typically develop two weeks to several months after exposure to the virus.

Typical features of the bumps include:

• Small size: most bumps are between about 2 and 5 millimeters across, roughly the size of a pinhead to a pencil eraser tip.
• Dome shape: the bumps are round, raised, and firm, often with a shiny or pearly surface.
• Central dimple: many bumps have a small dent or pit in the center, known as umbilication. This is a hallmark feature that helps doctors recognize the condition.
• Color: flesh-colored, white, pink, or slightly translucent.
• Grouping: bumps often appear in clusters or lines, particularly where the skin has been scratched.
• Location: in children, common sites include the face, trunk, arms, legs, and skin folds such as the armpits or behind the knees. In adults with sexually transmitted infection, bumps often appear on the lower abdomen, inner thighs, and genital area. The palms and soles are usually spared.

Symptoms can differ depending on the stage of the infection. Early lesions may look like tiny, smooth bumps without an obvious central dimple. As they mature, the classic dome shape with umbilication becomes clearer. Later, as the immune system begins to attack the virus, individual bumps may become red, swollen, and inflamed — this is sometimes called the “beginning of the end” sign, because inflamed lesions are often about to resolve. Some people, particularly those with eczema, develop an itchy, red rash around the bumps, known as molluscum dermatitis.

Most bumps are painless, though they can itch. Scratching or picking at them can spread the virus to nearby skin (a process called autoinoculation) and may introduce bacteria, causing a secondary bacterial infection with redness, warmth, pain, or pus.

In people with significantly weakened immune systems, lesions may be larger than usual (sometimes over a centimeter), more numerous, and more resistant to clearing.

Causes and risk factors

Molluscum contagiosum causes are well understood: the condition is caused by the molluscum contagiosum virus (MCV), a member of the poxvirus family. The virus infects only humans and replicates within skin cells, which is why it stays confined to the skin’s surface.

The virus spreads in several ways:

• Direct skin-to-skin contact: this is the most common route, including everyday contact between children during play and sexual contact between adults.
• Contaminated objects (fomites): the virus can survive on shared items such as towels, washcloths, clothing, sponges, gym equipment, or toys, and infect another person who touches them.
• Self-spread (autoinoculation): scratching, rubbing, or shaving over the bumps can carry the virus to new areas of the same person’s skin.

Contrary to a common belief, the virus is not thought to spread through the air, through coughing or sneezing. Whether it spreads through swimming pool water itself is uncertain; shared towels, kickboards, and close contact at pools may explain reported associations with swimming.

Factors that increase the risk of developing molluscum contagiosum or having a more extensive infection include:

• Young age: children between about one and ten years are most commonly affected.
• Eczema (atopic dermatitis): a damaged skin barrier and frequent scratching make it easier for the virus to take hold and spread.
• Weakened immune system: HIV infection, cancer treatment, organ transplantation, or immune-suppressing medicines can lead to more widespread and persistent lesions.
• Close-contact settings: households, daycare centers, and contact sports such as wrestling.
• Sexual activity: in adolescents and adults, genital lesions are usually acquired through sexual contact.
• Warm, humid climates: the infection is reported more often in these environments.

Diagnosis

Molluscum contagiosum diagnosis is usually straightforward and made clinically — that is, based on what the doctor sees during a physical examination. The characteristic appearance of small, firm, dome-shaped bumps with a central dimple is often enough to confirm the condition without any tests. A dermatologist (a doctor who specializes in skin conditions) can typically recognize molluscum contagiosum on sight.

When the appearance is less typical, doctors may use additional methods:

• Dermoscopy: a handheld magnifying instrument with a light allows the doctor to see the central pit and characteristic vessel patterns more clearly, supporting the diagnosis without any invasive procedure.
• Skin biopsy or curettage sampling: in rare, uncertain cases, a small sample of a bump may be removed and examined under a microscope. Molluscum lesions show distinctive inclusion bodies within skin cells (sometimes called Henderson-Paterson bodies), which confirm the diagnosis.

Blood tests and imaging studies such as X-rays or scans are not needed to diagnose molluscum contagiosum, because the infection is confined to the skin. However, your doctor may consider related testing in specific situations. For example, if an adult has genital lesions, the doctor may recommend screening for other sexually transmitted infections. If an adult develops unusually widespread, large, or persistent lesions, the doctor may look for an underlying problem with the immune system.

Part of the diagnostic process is ruling out conditions that can look similar, such as warts, skin tags, small cysts, folliculitis (inflamed hair follicles), and, in adults, certain other infections or skin growths. This is one reason it is worthwhile to have new or unusual skin bumps checked by a doctor rather than assuming the cause.

Treatment options for molluscum contagiosum

There is no single best molluscum contagiosum treatment for everyone. The right approach depends on the person’s age, the number and location of the bumps, whether they cause symptoms or distress, and the state of the immune system. An important starting point is this: in people with a healthy immune system, molluscum contagiosum usually goes away on its own, though this can take many months and sometimes a year or longer. Because of this, treatment is often optional rather than essential.

Watchful waiting

For many children with a limited number of bumps, doctors often recommend simply waiting for the infection to resolve naturally while taking steps to limit spread — such as covering lesions with clothing or a bandage, avoiding scratching, and not sharing towels. Watchful waiting avoids the discomfort, cost, and potential scarring of active treatments. The main drawbacks are that new bumps may appear while the infection runs its course, and the lesions remain contagious until they clear.

Procedures performed in the clinic

When treatment is chosen — for example, because lesions are spreading, causing distress, located in sensitive areas, or affecting an adult’s genital skin — several office-based procedures are commonly used:

• Cryotherapy: freezing each bump with liquid nitrogen. This is quick but can be uncomfortable and may cause temporary blistering or, occasionally, light or dark spots on the skin afterward.
• Curettage: gently scraping off the bumps with a small instrument, often after applying a numbing cream. This removes lesions immediately but can be frightening for young children and carries a small risk of scarring.
• Cantharidin: a blistering agent applied carefully by a clinician to individual bumps. It causes a small blister that lifts the lesion away. It is generally painless at the time of application, though blisters can be sore later.

Topical medications

Doctors may also prescribe creams or solutions applied at home, such as podophyllotoxin (mainly for adults with genital lesions) or certain irritant or retinoid preparations. The evidence for many topical treatments is mixed, and some — including imiquimod, an immune-stimulating cream — have not shown clear benefit for molluscum in well-conducted studies, so your doctor may or may not recommend them. Any home treatment should be used exactly as directed, since these products can irritate healthy skin.

Treatment in special situations

People with weakened immune systems may need a different approach, because standard treatments are often less effective when the immune system cannot help clear the virus. In these cases, addressing the underlying immune problem — for example, optimizing HIV treatment — is often the most important step, alongside dermatologic care. Surgery in the traditional sense is not needed for molluscum contagiosum; curettage and similar minor procedures are the most invasive options normally used.

Care for this condition is generally provided by a dermatology department; at Acibadem, dermatologists manage the assessment and treatment of molluscum contagiosum. Further information about how the condition is managed is available on the molluscum contagiosum treatment page.

Living with molluscum contagiosum / outlook

For most people with a healthy immune system, the long-term outlook is good. The bumps typically resolve on their own, most often within six to twelve months, although some cases take longer — occasionally a few years — especially when new lesions keep appearing as old ones heal. Once the infection clears completely, the bumps usually leave no scars unless they were scratched, secondarily infected, or aggressively treated. Clearing the infection does not guarantee lifelong protection; reinfection is possible after new exposure, although it appears to be uncommon.

While living with molluscum contagiosum, practical measures can reduce spread to others and to new areas of your own skin:

• Avoid scratching, picking, or squeezing the bumps.
• Cover lesions with clothing or a watertight bandage during activities involving close contact, such as sports or swimming.
• Do not share towels, washcloths, razors, clothing, or sports gear.
• Avoid shaving or waxing over affected skin, since this can spread the virus.
• Wash hands after touching the bumps.
• Adults with genital lesions should avoid sexual contact involving the affected skin until the lesions have cleared, and may wish to discuss screening for other infections with their doctor.
• If eczema is present, keeping it well controlled with moisturizers and prescribed treatments can help limit spread.

Children with molluscum contagiosum do not usually need to be kept home from school or daycare, though covering visible lesions is often advised. The condition can affect self-confidence, particularly when bumps are on visible areas such as the face; if the appearance causes significant distress, discussing treatment options with a doctor is reasonable even when waiting would otherwise be acceptable.

Frequently asked questions

What is molluscum contagiosum and is it dangerous?

Molluscum contagiosum is a contagious viral skin infection that causes small, dome-shaped bumps, often with a central dimple. For people with a healthy immune system, it is generally not dangerous: it stays on the skin’s surface, does not affect internal organs, and usually resolves on its own over time. In people with significantly weakened immune systems, the infection can be more extensive and harder to clear, so medical review is advisable in that situation.

Can molluscum contagiosum go away on its own?

Yes, in most cases it does. In people with normal immune function, the bumps typically clear without treatment, often within six to twelve months, though the full course can be longer if new bumps keep forming. Because natural resolution is common, doctors frequently recommend watchful waiting for children with only a few lesions, while using simple measures to limit spread in the meantime.

How do you catch molluscum contagiosum?

The virus spreads through direct skin-to-skin contact, through shared items such as towels, washcloths, or sports equipment, and by self-spread when a person scratches the bumps and transfers the virus to new areas of skin. In adolescents and adults, genital lesions are usually acquired through sexual contact. The virus is not believed to spread through coughing or sneezing.

How is molluscum contagiosum diagnosed?

Diagnosis is usually made by a doctor’s visual examination, because the bumps have a characteristic appearance. A dermatologist may use dermoscopy — a magnifying instrument with a light — to see the central dimple more clearly. In rare, uncertain cases, a small skin sample may be examined under a microscope to confirm the diagnosis. Blood tests and imaging scans are not needed for the diagnosis itself.

What is the best treatment for molluscum contagiosum?

There is no single best option, and treatment is often not required at all. Depending on the situation, doctors may suggest watchful waiting, freezing the bumps with cryotherapy, gently scraping them off with curettage, applying a blistering agent such as cantharidin in the clinic, or using certain prescription creams. Each approach has advantages and drawbacks, and the choice depends on the person’s age, the location and number of lesions, and personal preference, so it is best decided together with a doctor.

How long does molluscum contagiosum last?

Individual bumps often last around two months, but because new bumps can appear while older ones heal, the overall infection commonly lasts six to twelve months and sometimes longer. Duration varies from person to person, and people with eczema or weakened immune systems may experience a more prolonged course. Once all lesions have cleared, the infection is generally considered resolved.

Does molluscum contagiosum leave scars?

In most cases, no. Bumps that resolve on their own usually heal without scarring. Scars or changes in skin color can occur if the lesions are scratched, become infected with bacteria, or are treated with methods that injure the surrounding skin. Avoiding picking and following aftercare instructions after any procedure helps reduce this risk, although outcomes cannot be guaranteed for any individual.

When to see a doctor

Many cases of molluscum contagiosum can be managed with patience and simple hygiene measures, but medical assessment is worthwhile whenever you are unsure what a skin bump is, since other conditions can look similar. It is particularly important to see a doctor if any of the following apply:

• You are not sure the bumps are molluscum contagiosum, or they look unusual, grow quickly, bleed, or change in color.
• Signs of bacterial infection develop around a lesion: spreading redness, warmth, swelling, significant pain, pus, or fever.
• Bumps appear on or around the eyelids or eyes, which can cause eye irritation or inflammation and may need specialist care.
• Lesions appear in the genital area, especially in adults, so that other sexually transmitted infections can be considered and ruled out.
• The bumps are very numerous, unusually large, or keep spreading despite precautions — particularly in someone with a weakened immune system, HIV, cancer treatment, or immune-suppressing medication.
• The lesions are painful, intensely itchy, or causing significant emotional distress or problems at school or work.
• The bumps have not improved after many months, or you would like to discuss active treatment options.
• Genital lesions appear in a child, which should always be evaluated by a doctor.

A doctor — often a dermatologist — can confirm the diagnosis, rule out other conditions, and help you choose between watchful waiting and active molluscum contagiosum treatment based on your individual circumstances.