Molluscum Contagiosum: The Bumpy STI That Isn't Genital Warts

Introduction

Noticing small, firm bumps on or around the genital area can be a source of significant anxiety. Many people immediately worry that these bumps may be genital warts, and the concern can feel overwhelming — particularly after recent sexual contact or a change in partner. However, molluscum contagiosum is one of several conditions that can produce small, raised bumps in the genital region, and it is frequently mistaken for genital warts despite being caused by an entirely different virus.

It is important to understand that bumps on the genitals can have several possible causes, and appearance alone cannot confirm the underlying condition. Many causes are not sexually transmitted at all, whilst others — including molluscum contagiosum — may be passed through close skin-to-skin contact, which can include but is not limited to sexual activity. STI testing may help provide clarity when there has been potential exposure or when symptoms are persistent.

Our clinic provides confidential STI testing services. We do not provide GP services or dermatology consultations, but we can advise on appropriate next steps if further medical care is needed.

Molluscum contagiosum is a common viral skin infection that causes small, firm, dome-shaped bumps, often with a dimple in the centre. It is caused by a poxvirus — not the human papillomavirus (HPV) that causes genital warts. In adults, molluscum contagiosum may be transmitted through close skin-to-skin contact, including sexual contact. Because the bumps can resemble genital warts or other skin conditions, appearance alone cannot confirm the cause. STI testing may help rule out other infections when there is concern.

Possible causes of small bumps in the genital area may include:

• Molluscum contagiosum
• Genital warts (HPV)
• Blocked hair follicles or folliculitis
• Fordyce spots (harmless sebaceous glands)
• Friction or shaving irritation
• Other skin conditions unrelated to STIs

Symptoms alone cannot confirm an STI.

When Could Bumps on the Genitals Be Linked to an STI?

Small bumps in the genital area may sometimes be associated with a sexually transmitted infection, particularly when they appear following unprotected sexual contact or contact with a new partner. However, many bumps in this region are caused by entirely harmless conditions such as blocked glands, friction, or minor skin irritation. Because multiple conditions share a similar appearance, it is not possible to determine the cause based on visual assessment alone. If bumps persist or there has been recent potential exposure, STI testing may be a sensible step.

Understanding Molluscum Contagiosum

Molluscum contagiosum is caused by the molluscum contagiosum virus (MCV), a member of the poxvirus family. It is not related to the human papillomavirus (HPV), which is the virus responsible for genital warts. This distinction is significant because the two conditions require different clinical management, and the long-term implications differ considerably.

The bumps caused by molluscum contagiosum are typically small — usually between two and five millimetres in diameter — firm, and dome-shaped. They often have a characteristic small dimple or indentation in the centre, sometimes described as "umbilicated." The bumps are usually painless, though they may occasionally itch.

Molluscum contagiosum is remarkably common. In children, it frequently appears on the arms, legs, and torso and is spread through casual skin contact or shared items such as towels. In adults, when the bumps appear in the genital region, transmission may occur through sexual or intimate skin-to-skin contact. However, it is important to note that molluscum contagiosum is not exclusively a sexually transmitted infection — it can be spread through any close physical contact.

In most cases, molluscum contagiosum resolves on its own without treatment, though this can take several months. The condition is generally considered benign.

Common Non-STI Causes of Genital Bumps

Many people who notice bumps on or around the genital area may not have an STI. Several common, harmless conditions can produce similar-looking lesions:

Fordyce Spots

These are small, pale or white bumps that appear on the shaft of the penis, the labia, or the inner lips of the mouth. They are visible sebaceous (oil) glands and are completely normal. Fordyce spots are not infectious and require no treatment.

Folliculitis

Inflammation of hair follicles can produce small, red, sometimes pus-filled bumps. This is particularly common in areas where hair is shaved or waxed and may occur after exercise or in warm, humid conditions.

Blocked Glands

Sebaceous cysts or blocked sweat glands can form firm, painless lumps beneath the skin. These are generally harmless and may resolve without intervention.

Friction or Irritation

Tight clothing, vigorous exercise, or prolonged friction can cause small bumps or irritation in the groin and genital area. These typically resolve once the source of irritation is removed.

Ingrown Hairs

Shaving, waxing, or other hair removal methods can cause hairs to grow back into the skin, producing red, sometimes painful bumps that may resemble an infection. Our article on small bumps on genitals: STI or ingrown hair explores this topic further.

Situations Where Bumps May Appear

Understanding the context in which bumps appear can sometimes help provide perspective, though it cannot replace professional assessment or testing:

After Sexual Contact

Bumps appearing days or weeks after sexual contact may understandably raise concern. However, friction during intercourse can cause minor skin irritation, and the timing may be coincidental with an unrelated skin change.

After Shaving or Waxing

Hair removal in the genital area is a very common cause of bumps, redness, and irritation. Ingrown hairs and folliculitis may develop within days of shaving and can be mistaken for infection-related lesions.

After Exercise

Sweating and friction during physical activity can lead to irritation, blocked pores, and folliculitis, particularly in the groin area.

During Hormonal Changes

Hormonal fluctuations — during menstrual cycles, pregnancy, or periods of stress — can affect the skin and may contribute to changes in sebaceous gland activity, leading to bumps or spots.

STIs That May Cause Similar Symptoms

Whilst many genital bumps are harmless, some sexually transmitted infections can cause raised lesions in the genital area. It is important to consider these possibilities without assuming that bumps automatically indicate an STI:

Genital Warts (HPV)

Caused by certain strains of the human papillomavirus, genital warts typically appear as soft, flesh-coloured growths that may have a cauliflower-like texture. They differ from molluscum contagiosum bumps, which tend to be smoother and more dome-shaped with a central dimple. However, distinguishing between the two based on appearance alone is not always straightforward.

Herpes Simplex Virus (HSV)

Genital herpes may cause clusters of small blisters that can ulcerate and become painful. Whilst the presentation differs from molluscum contagiosum, early or mild herpes outbreaks may occasionally cause confusion. A herpes test can help clarify the cause when there is uncertainty.

Syphilis

The primary stage of syphilis can produce a single, painless sore (chancre) that may be mistaken for other conditions. Secondary syphilis may cause a rash. A syphilis test may be considered if there is concern about potential exposure.

Other STIs

Some infections, such as chlamydia and gonorrhoea, do not typically cause visible bumps but may produce other symptoms such as unusual discharge or discomfort during urination. A chlamydia test or broader screening may be appropriate depending on individual circumstances.

It is worth noting that many STIs cause mild or no symptoms at all, which is why testing based on exposure history — not just symptoms — can be important.

How Molluscum Contagiosum Symptoms Can Overlap With Other Conditions

One of the most challenging aspects of genital bumps is that several different conditions can look remarkably similar. Molluscum contagiosum, genital warts, folliculitis, and even normal skin variations such as Fordyce spots may all present as small, raised bumps in the same area.

The characteristic central dimple of molluscum contagiosum can be a distinguishing feature, but it is not always visible — particularly when bumps are small or inflamed. Similarly, early-stage genital warts may appear as small, smooth bumps before developing their more characteristic texture.

This overlap is precisely why appearance alone cannot confirm the cause of genital bumps. Visual self-assessment, whilst understandable, carries a significant risk of both false reassurance and unnecessary alarm. Professional clinical assessment and, where appropriate, STI testing provide a more reliable pathway to clarity.

When STI Testing May Be Sensible

There are several situations in which STI testing may be a reasonable and proactive step:

• Persistent bumps — Bumps that do not resolve within a few weeks may warrant further investigation.
• New sexual partner — Any change in sexual partner introduces the possibility of new exposure.
• Unprotected sexual contact — Condomless sex increases the potential for transmission of several STIs, though some infections, including molluscum contagiosum, can be transmitted despite condom use through skin-to-skin contact in areas not covered by the condom.
• Partner diagnosed with an STI — If a sexual partner has been diagnosed with an STI, testing is generally advisable regardless of whether symptoms are present.
• Worsening symptoms — Bumps that are increasing in number, changing in appearance, or becoming painful may benefit from professional assessment.
• Peace of mind — Anxiety about potential exposure can itself be distressing. Testing can provide reassurance even when the risk is considered low.

Testing decisions should be based on symptoms, exposure history, and individual risk factors rather than assumptions.

How STI Testing Works

STI testing is a straightforward, confidential process. The type of test recommended depends on the symptoms and the infections being screened for:

Swab Tests

A swab may be taken from the affected area, the throat, or the rectum depending on the type of contact and symptoms. Swabs are typically quick and cause minimal discomfort.

Urine Tests

A simple urine sample can be used to screen for infections such as chlamydia and gonorrhoea. No physical examination is required for urine-based tests.

Blood Tests

Blood samples may be used to test for infections including HIV, syphilis, and hepatitis. Blood tests are particularly important for infections that may not produce visible symptoms.

Laboratory Analysis

Samples are sent to accredited laboratories for analysis. Results are typically available within a few working days, depending on the tests performed.

Confidential Results

Results are communicated confidentially, and guidance on next steps is provided based on the outcomes. For more information about molluscum contagiosum as a condition, see our dedicated page.

When Bumps Are Less Likely to Be an STI

In many cases, genital bumps have straightforward, non-infectious explanations. The following contexts may suggest a lower likelihood of an STI-related cause:

• Bumps appeared immediately after shaving or waxing — Irritation from hair removal is extremely common and typically resolves within days.
• Bumps are symmetrical and have been present for a long time — Long-standing, unchanging bumps may represent normal skin variations such as Fordyce spots or pearly penile papules.
• No recent sexual contact — Without recent sexual exposure, the probability of a new sexually transmitted infection is significantly reduced, though some infections can have long incubation periods.
• Bumps resolved quickly without treatment — Transient bumps that appear and disappear within a few days are more likely related to irritation or minor skin changes.
• No other symptoms — The absence of additional symptoms such as discharge, pain, or systemic illness may provide some reassurance, though it does not exclude infection entirely.

Even in lower-risk situations, testing may still be appropriate if there is uncertainty or ongoing concern.

Frequently Asked Questions

Can small bumps on the genitals be normal?

Yes. Several completely normal skin features, such as Fordyce spots, pearly penile papules, and vestibular papillomatosis, can appear as small bumps in the genital area. These are harmless variations and are not caused by infection. However, if there is any uncertainty, professional assessment or testing may help provide clarity.

Does molluscum contagiosum always mean I have an STI?

Not necessarily. Whilst molluscum contagiosum can be transmitted through sexual contact in adults, it can also be spread through non-sexual close skin contact. It is classified as a viral skin infection rather than exclusively as an STI. The context of transmission varies between individuals. If you are concerned about genital warts specifically, see our guide on whether genital warts can be cured.

Should I get tested if bumps disappear on their own?

In some cases, testing may still be advisable even after bumps have resolved. Some STIs can produce symptoms that come and go, and the absence of visible symptoms does not always mean an infection has cleared. If there has been a potential exposure, testing based on timing and risk factors may still be appropriate.

How soon after exposure should I get tested?

Testing windows vary by infection. Some STIs can be detected within days, whilst others require several weeks before a test can provide accurate results. Guidance on optimal testing timing can be provided based on the type of exposure and the infections being considered.

Are genital bumps common?

Genital bumps are very common and, in many cases, are caused by entirely harmless conditions. Folliculitis, ingrown hairs, blocked glands, and normal skin variations account for a large proportion of bumps that cause concern. However, because some STIs can also cause bumps, testing may be sensible when there is potential exposure.

Can I tell the difference between molluscum and genital warts myself?

Whilst molluscum contagiosum and genital warts may have different characteristics — molluscum bumps tend to be smoother with a central dimple, whilst warts may have a rougher texture — there is significant overlap in appearance. Self-diagnosis based on visual assessment is not reliable, and professional assessment is recommended.

When to Seek Medical Advice

Whilst many genital bumps are harmless and resolve without intervention, certain situations may warrant prompt medical attention:

• Severe or increasing pain in the genital area
• Open sores or ulcers that are not healing
• Fever or general malaise accompanying genital symptoms
• Rapidly spreading bumps or rash
• Bumps that bleed, weep, or change colour
• Persistent symptoms that are not improving over several weeks

If symptoms persist or worsen, consultation with an appropriate healthcare service may be advised. This may include a GP, sexual health clinic, or dermatology service depending on the nature of the symptoms.

Confidential STI Testing in the UK

If you are concerned about possible STI symptoms or exposure, confidential STI testing appointments are available at our UK clinic. Testing decisions depend on symptoms, exposure history, and individual risk factors.

Our service provides private STI testing in a discreet and professional setting. Results are handled confidentially, and guidance on appropriate next steps is available where further care may be beneficial.

For more information or to arrange a testing appointment, visit our website.

Disclaimer: This article is for general informational purposes only and does not constitute medical advice, diagnosis, or treatment. The information provided is not a substitute for professional clinical judgement. Sexual health concerns should be assessed on an individual basis by a qualified healthcare professional. If you are experiencing persistent, severe, or worsening symptoms, please consult an appropriate healthcare service. Our clinic provides private STI testing services only — we do not prescribe medication, provide ongoing treatment, or offer GP services.

Next Review Due: 28 March 2027