B78.1 Cutaneous strongyloidiasis

Name of the Condition

• Cutaneous strongyloidiasis

Summary

Cutaneous strongyloidiasis is a parasitic skin infection caused by the nematode Strongyloides stercoralis, resulting in localized skin manifestations. It is part of a broader infection that may involve the gastrointestinal tract and other systems, with cutaneous symptoms often being an early or prominent feature.

Causes

The condition is caused by infection with the Strongyloides stercoralis parasite. Larvae penetrate the skin, typically through contact with contaminated soil, and migrate to the skin surface, leading to cutaneous symptoms.

Risk Factors

• Residing in or traveling to tropical and subtropical regions.
• Walking barefoot on contaminated soil.
• Immunocompromised state, such as due to HIV/AIDS or long-term corticosteroid use.

Symptoms

• Pruritic (itchy) rash, often at the site of larval penetration.
• Erythematous (reddened) or urticarial (hive-like) lesions.
• Migratory skin tracks or linear eruptions.

Diagnosis

Diagnosis involves identifying the parasite through skin biopsy or serological tests. Microscopic examination of skin scrapings or tissue samples may detect larvae, while serological tests can confirm exposure to Strongyloides stercoralis.

Treatment Options

• Ivermectin is the primary treatment, effectively eradicating the parasite.
• Albendazole can be used as an alternative in some cases.
• Treatments help relieve symptoms and eliminate the parasite from the skin and body.

Prognosis and Follow-Up

With appropriate treatment, the prognosis is generally good. Re-infection can occur; follow-up may be necessary to monitor for recurrence or progression to systemic disease, especially in immunocompromised individuals.

Complications

• Hyperinfection syndrome, leading to widespread larval migration and severe systemic illness.
• Disseminated strongyloidiasis, particularly in immunocompromised patients.
• Secondary bacterial infections from skin lesions.

Lifestyle & Prevention

• Avoid walking barefoot in endemic areas.
• Wear protective footwear and clothing when in contact with soil.
• Practice good hygiene and wound care to prevent larval entry.

When to Seek Professional Help

Seek medical attention if you experience persistent or worsening skin rashes, especially after travel to endemic regions, or if you have a weakened immune system and suspect parasitic infection.

Tips for Medical Coders

Document the presence of cutaneous symptoms and confirmatory diagnostic findings (e.g., skin biopsy, serology) to support the B78.1 code. Ensure differentiation from other dermatological conditions and note any associated systemic involvement for accurate coding.