VHOSPITAL.CLINIC · Parasite-Related Symptom
A distinctive, rapidly migrating urticarial rash — called larva currens — is pathognomonic for strongyloidiasis. Moving at 5–10 cm per hour along the perianal and truncal skin, it reflects the autoinfective migration of Strongyloides larvae through the dermis.
In autoinfection, Strongyloides larvae penetrate the perianal mucosa or skin, migrate rapidly through the dermis leaving a trail of eosinophilic inflammation, and produce the characteristic moving, raised, erythematous track — larva currens — that distinguishes strongyloidiasis from other cutaneous larva migrans.
Skin Rash rarely appears alone. Strongyloidiasis also commonly causes:
Confirming Strongyloidiasis as the cause:
Larva currens appears as a raised, red, serpiginous (snake-like) track or urticarial streak, typically around the buttocks, thighs, and lower trunk. It moves rapidly — up to 10 cm/hour — which distinguishes it from other skin rashes.
Larva currens moves at 5–10 cm per hour — significantly faster than cutaneous larva migrans from hookworm (which moves ~1–2 cm per day). This rapid movement is diagnostic when observed.
No. Larva currens is intermittent and may appear and disappear over years as autoinfection cycles occur. Many patients have the rash only during recurrent episodes. Chronic infection often has no rash at all.
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