A serpiginous burrow on the foot A guy presents with pruritic, serpiginous cords about his left feet erectile dysfunction pills . What are these lesions and how should they be treated? After a beach holiday in Thailand, a 23-year-old guy created pruritic, serpiginous cords on the sole and medial facet of his left feet . The cords acquired commenced with an itchy papule, which over the next three weeks shaped an erratic intersecting pattern with focal areas which were eroded, crusted, pustular or haemorrhagic. A skin biopsy showed subepidermal and intraepidermal blisters with eosinophils that prolonged diffusely into the underlying dermis and subcutis .