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Trichobilharzia cercarial dermatitis

Last edited: 4/15/2026

Overview

Trichobilharzia cercarial dermatitis, commonly known as "swimmers' itch," is a parasitic skin condition caused by the penetration of cercariae from snails into human skin, typically occurring in freshwater environments worldwide. It manifests as an intensely pruritic rash often mistaken for insect bites, usually resolving spontaneously within one week 1.

Diagnosis

  • Characteristic intensely pruritic rash, often linear or grouped papules 1.
  • History of recent freshwater exposure 1.
  • No specific diagnostic tests; clinical presentation and history are key 1.

    • Management

  • First-line treatments: Antihistamines (e.g., cetirizine, loratadine) for pruritus relief 1.
  • Adjunctive treatments: Topical corticosteroids for inflammation 1.
  • Preventive measures: Avoidance of contaminated water sources; drying off promptly after exposure may reduce risk 1.

    • Special Populations

  • Pregnancy: No specific guidelines provided; symptomatic treatment with antihistamines is likely safe but consult dermatology 1.
  • Pediatrics: Similar management as adults; close monitoring for excessive scratching to prevent secondary infections 1.
  • Elderly: Increased risk of complications from scratching; emphasize symptomatic relief and skin care 1.
  • Comorbidities: No specific adjustments noted; manage symptoms carefully to avoid exacerbating existing conditions 1.

    • Key Recommendations

  • Consider cercarial dermatitis in patients with a history of freshwater exposure presenting with intensely pruritic rash 1 (Evidence: Moderate).
  • Initiate symptomatic treatment with antihistamines for pruritus relief 1 (Evidence: Moderate).
  • Advise patients to dry off thoroughly after water exposure to reduce risk of infection 1 (Evidence: Expert opinion).

    • References

    1 Hoeffler DF. "Swimmers' itch" (cercarial dermatitis). Cutis 1977. link

    Original source

    1. [1]
      "Swimmers' itch" (cercarial dermatitis). — Hoeffler DF Cutis (1977)
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