We report the case of an eight-year-old boy with hypereosinophilia who presented with a swelling under his right armpit that had persisted for more than four weeks. A second-stage larva of Wohlfahrtia magnifica was found, leading to the diagnosis of cutaneous myiasis. Following removal of the larva, the clinical and hematological manifestations returned to normal. Diagnosis of myiasis should always be kept in mind in the event of clinical signs of furuncular lesions, which may be accompanied by eosinophilia.