An otherwise healthy 39-year-old Indian labourer presented with five-day history of intensely pruritic, progressive, serpiginous skin eruptions on his back. A few days prior to onset of symptoms, he had worked at a construction site carrying sandbags over his bare back. He had no other complaints suggestive of any systemic involvement. Cutaneous examination revealed multiple skin-coloured to erythematous thread-like curvilinear tracts of various sizes (3 to 14 cm in length) distributed haphazardly over the entire back (figure 1); few tracts showing healing at one end and progression at the other were also noted. Laboratory examination was notable for mild anaemia and eosinophilia (absolute eosinophil count 1150 cells/μl).