Molluscum contagiosum testing

It depends on how it was acquired. In children, molluscum passes through ordinary non-sexual skin contact — swimming pools, shared towels, contact play — and is not an STI. In adults, clusters of bumps on the genitals, groin, inner thighs, or lower abdomen are usually acquired through sexual skin-to-skin contact, which makes genital molluscum in adults a sexually transmitted infection in that context. It is not caused by bacteria or the same viruses as classic STIs (chlamydia, herpes, HPV), but it warrants an STI evaluation because the same sexual contact that transmitted molluscum may also have transmitted other infections.

Yes — in people with a healthy immune system, molluscum is self-limiting. The body's immune response clears it in 6–18 months on average, though it can take up to 24 months in some cases. During that entire time, the bumps are contagious to sexual partners, and scratching or shaving can spread them to new skin areas. Because genital molluscum poses ongoing transmission risk, clinicians generally recommend treating adult genital lesions to shorten the contagious period and prevent autoinoculation — but watchful waiting is a legitimate choice for mild non-genital cases in healthy adults, after discussion with a clinician.

Molluscum bumps are dome-shaped, firm, flesh-colored, and have a characteristic central dimple (umbilication) — like a tiny crater at the top of the bump — with a waxy core inside. Genital warts (HPV 6/11) tend to be rough, flat, or cauliflower-textured, without the dimple or waxy center, and may be single or clustered but do not have a central pit. Herpes causes painful or tender fluid-filled blisters that break open into shallow painful ulcers and crust over — very different from firm, smooth, painless dome-shaped bumps. All three are caused by unrelated viruses (poxvirus vs. HPV vs. herpesvirus), require different treatments, and can occasionally co-occur. A clinician examination rather than self-diagnosis is always the right approach.

No — this is one of the most important things not to do. Squeezing or popping molluscum bumps releases the virus-laden waxy core directly onto surrounding skin, seeding new lesions in adjacent areas (autoinoculation). It also creates an open wound vulnerable to bacterial infection (staph, strep), which can lead to scarring. Leave the bumps alone, avoid scratching them, and see a clinician for safe removal options. Cryotherapy and curettage remove lesion cores without spreading viral material across the skin.

You should avoid skin-to-skin sexual contact with affected areas until all lesions have fully resolved. Condoms reduce but do not eliminate the risk because molluscum bumps often appear on the inner thighs, groin, lower abdomen, and pubic area — well outside the condom's coverage zone. Most clinicians advise refraining from unprotected sexual contact until all lesions are cleared and to notify recent partners so they can be examined. If you choose to have sex before full resolution, use condoms consistently and ensure a partner is aware of the situation.

The key precautions to prevent autoinoculation: do not scratch or pick at bumps; do not shave over affected areas — razors are particularly efficient at spreading viral material; wash hands after any contact with lesions; use separate towels for affected areas; keep bumps covered with clothing where possible; avoid contact sports or activities that involve rubbing against others. Getting treatment to remove existing lesions is the most reliable way to eliminate the viral reservoir and stop autoinoculation — each lesion that persists is a potential source for new clusters.

You are contagious as long as any bump is present and intact. Unlike herpes, which establishes latency in nerve tissue and can reactivate years later, molluscum virus is completely cleared from the body once all lesions resolve — there is no long-term latency. This means that after resolution (spontaneous or post-treatment), you are no longer contagious and cannot spread the infection. Total contagious period without treatment averages 6–18 months; with treatment, it can be reduced to weeks. Reinfection from a new exposure to an infected partner remains possible after clearance.

Several effective options are available. <strong>In-office procedures:</strong> Curettage (scraping out the core of each lesion), cryotherapy (freezing with liquid nitrogen), and cantharidin application (0.7% Ycanth, FDA-approved 2023 — a blistering agent applied precisely to each bump) are the most immediately effective methods requiring 1–3 sessions. <strong>Prescription home-use topicals:</strong> Berdazimer gel 10.3% (Zelsuvmi) was FDA-approved in 2024 for once-daily home use in adults and children ≥1 year old. Podophyllotoxin 0.5% cream is effective for genital lesions but is contraindicated in pregnancy. Imiquimod 5% cream is used off-label for molluscum. <strong>Observation:</strong> For healthy adults with few non-genital lesions, doing nothing and allowing immune clearance over 6–18 months is legitimate — discuss the pros and cons with your clinician based on location, number, and whether you have sexual partners at risk.

A healthy immune system keeps molluscum in check and clears it within months. When the immune system is severely weakened — as in untreated HIV with low CD4 counts — molluscum can spread to hundreds of giant lesions across the body and face that resist all topical treatments. Widespread, treatment-resistant facial molluscum in an adult is sometimes the first visible clinical indicator of significant immune compromise, prompting clinicians to recommend HIV testing in that context. For people living with HIV, initiating or optimizing antiretroviral therapy (ART) to raise CD4 counts is typically the most effective molluscum intervention — as immunity recovers, the body's own immune response clears the lesions.

In most cases, no. A clinician diagnoses molluscum by examining the characteristic dome-shaped, centrally dimpled bumps — no blood test, swab, or PCR is needed for a typical clinical presentation. For atypical presentations, a squash preparation (gently expressing the waxy core onto a glass slide and examining under a microscope) or dermoscopy can rapidly confirm the diagnosis by identifying Henderson-Paterson bodies or the characteristic polylobular internal structures. A punch biopsy is occasionally done for highly atypical lesions. The more important reason to visit a clinician is to rule out conditions that look similar but require different treatment — herpes, genital warts, and syphilis.

Molluscum contagiosum is not known to harm the fetus and is not transmitted from mother to baby during delivery. Treatment during pregnancy is generally considered safe when desired; cryotherapy (liquid-nitrogen freezing) and curettage (scraping) are the preferred options because they are localized, effective, and avoid significant systemic drug exposure. Podophyllotoxin cream — commonly used for genital molluscum in non-pregnant adults — is contraindicated in pregnancy and must be avoided. Berdazimer gel (Zelsuvmi) and imiquimod have limited human pregnancy safety data; discuss with your OB or midwife before using any topical treatment during pregnancy.

For people with a healthy immune system, molluscum is a benign, self-limiting infection with no serious long-term health consequences. The main risks are autoinoculation (spread to new skin areas), secondary bacterial infection from scratching, cosmetic concerns, and transmission to sexual partners or household members during the contagious period. The picture is very different for people with HIV or significant immunosuppression: in that setting, molluscum can become extensive, disfiguring, and treatment-resistant, and is sometimes the first visible sign of serious immune decline. Prompt evaluation, HIV testing if status is unknown, and effective ART are important in that context.