B08.1 Molluscum contagiosum

Name of the Condition

• Molluscum contagiosum

Summary

Molluscum contagiosum is a common viral skin infection characterized by small, raised, pearl-like bumps (mollusca) on the skin. The condition is caused by the molluscum contagiosum virus (MCV) and typically affects the face, neck, armpits, arms, and legs. It is generally self-limiting but may persist for months to years in some individuals.

Causes

The infection is caused by the molluscum contagiosum virus, a member of the poxvirus family. Transmission occurs through direct skin-to-skin contact with an infected person or by touching contaminated objects (e.g., towels, toys). The virus can also spread through sexual contact or autoinoculation (spreading to other areas of the body).

Risk Factors

• Close contact with individuals who have active molluscum lesions.
• Participation in activities with skin-to-skin contact (e.g., sports, swimming).
• Weakened immune systems (e.g., HIV, immunosuppressive therapy).
• Atopic dermatitis or other skin conditions that disrupt the skin barrier.

Symptoms

• Small, firm, dome-shaped papules with a central indentation (umbilicated).
• Lesions are typically painless but may become red, swollen, or itchy if irritated.
• Lesions may appear singly or in clusters and can range from 1 mm to 5 mm in size.
• In some cases, lesions may develop around the eyes, genitals, or other sensitive areas.

Diagnosis

Diagnosis is primarily clinical, based on the appearance of characteristic lesions. A healthcare provider may examine the skin and, in rare cases, perform a biopsy or viral culture to confirm the diagnosis. No specific laboratory tests are routinely required.

Treatment Options

• Observation, as lesions often resolve spontaneously within 6–12 months.
• Topical treatments (e.g., cantharidin, imiquimod, or cryotherapy) to remove lesions.
• Curettage (scraping) or laser therapy for persistent or widespread cases.
• Avoidance of scratching to prevent spreading or secondary infection.

Prognosis and Follow-Up

Most cases resolve without scarring, though some individuals may experience recurrence. Follow-up is generally not required unless lesions persist, spread, or cause discomfort. In immunocompromised patients, lesions may be more extensive and require closer monitoring.

Complications

• Secondary bacterial infection from scratching.
• Scarring or hyperpigmentation after treatment.
• Spread to other areas of the body (autoinoculation).
• Rarely, persistent or disfiguring lesions in immunocompromised individuals.

Lifestyle & Prevention

• Avoid sharing personal items (e.g., towels, razors) with infected individuals.
• Practice good hand hygiene, especially after touching lesions.
• Refrain from scratching or picking at lesions to prevent spread.
• Use barrier protection during sexual contact if lesions are present.

When to Seek Professional Help

• Lesions are widespread, painful, or rapidly increasing in number.
• Lesions appear on the face, eyes, or genitals.
• Symptoms persist for more than 12 months without improvement.
• Signs of secondary infection (e.g., redness, pus, fever).

Tips for Medical Coders

• Code B08.1 is specific to molluscum contagiosum and should be used when the diagnosis is confirmed.
• Documentation should include the location and extent of lesions, as well as any treatment provided.
• Ensure the code is not used for other poxvirus infections (e.g., variola or vaccinia) or unrelated skin conditions.
• Note any complications (e.g., secondary infection) with additional codes if applicable.