Diagnosis: Cutaneous larva migrans
A 32-year-old male presents with a serpiginous, pruritic tract on the right foot that developed after returning from a beach vacation in Central America. The lesion, characterized by its winding appearance and intense itching, raises suspicion for a parasitic infection commonly associated with sandy environments.
A 32-year-old male presents with a 10-day history of a serpiginous, pruritic tract on the dorsum of the right foot. He reports significant itching and discomfort. On examination, the lesion is noted to be raised, erythematous, and follows a winding path, with a clear demarcation at the edges.Location: Right foot, dorsum.Appearance: Serpiginous, raised, and erythematous tract.Itching: Intense pruritus associated with the lesion.Duration: Present for 10 days, worsening over time.Travel history: Recent trip to a Central American beach.
The patient reports that the lesion began approximately one week after returning from a beach vacation where he walked barefoot on the sand. He denies any prior treatments for the lesion and has no significant past medical history. He enjoys outdoor activities and has a history of similar lesions in the past, but this episode is particularly severe.Onset: Lesion developed 7 days post-beach exposure.Triggers: Direct contact with sandy soil.Past treatments: No prior treatments attempted.Medical history: No significant past medical history.Family history: Non-contributory.Social history: Enjoys outdoor activities, recently traveled to Central America.
Acute / First-Line ManagementAlbendazole: 400 mg orally once; effective against larval forms.Ivermectin: 200 mcg/kg orally once; alternative option for treatment.Topical corticosteroids: Consider for symptomatic relief of pruritus.Workup and Diagnostic ConfirmationClinical diagnosis: Primarily based on characteristic appearance and travel history.Skin scraping: May be performed, but often not necessary.Serologic testing: Not routinely indicated for diagnosis.Long-Term ManagementPrevention: Advise wearing footwear in sandy areas to reduce risk of reinfection.Follow-up: Re-evaluate in 1-2 weeks to ensure resolution of symptoms.Education: Inform patient about typical presentation to facilitate early recognition of future episodes.
Cutaneous leishmaniasis: Characterized by ulcerative lesions and associated with travel to endemic areas; often requires biopsy for diagnosis.Scabies: Presents with intense pruritus and burrows; typically involves web spaces and flexural areas.Contact dermatitis: May cause localized pruritic lesions; history of exposure to irritants or allergens is crucial for diagnosis.Fungal infection: Tinea corporis can mimic serpiginous lesions; KOH prep can aid in diagnosis.Insect bites: Can present with linear or serpiginous tracks; history of exposure to insects or outdoor activities is important.Nummular eczema: Presents as coin-shaped lesions; usually associated with dry skin and can be itchy.Erythema migrans: Characteristic of Lyme disease; history of tick exposure and systemic symptoms may be present.Granuloma annulare: Typically presents as annular plaques; usually asymptomatic and may require biopsy for confirmation.
High-Yield PearlsSerpiginous appearance: The classic winding track is a hallmark of this parasitic infection.Travel history: Always inquire about recent travel to endemic regions for accurate diagnosis.First-line treatment: Albendazole and ivermectin are effective treatments to consider.Prevention: Educate patients on the importance of footwear in sandy environments to avoid reinfection.Diagnosis: Often clinical; laboratory tests may not be necessary unless complications arise.Early recognition and treatment of parasitic infections can prevent significant morbidity and facilitate quicker recovery.
Tags: cutaneous larva migrans, Ancylostoma