Pyomyositis is an acute bacterial infection involving one or multiple striated muscles, potentially leading to abscess formation. Albeit being uncommon, its consequences for the patient can be severe, even fatal. Primarily described in tropical countries, this condition may also occur in temperate regions. Its pathophysiology is still poorly understood. The initiating process could be a minor muscle traumatism followed by bacterial hematogenous colonization of the muscle. Generally, its clinical presentation is insidious and unspecific, its diagnosis being challenging for the clinician. Nevertheless, a rapid diagnosis allows an early antibiotherapy to be established and complications to be prevented. The cornerstone of pyomyositis diagnosis is magnetic resonance imaging (MRI), along with bacterial cultures from biological fluids. The main bacteria involved in this condition is Staphylococcus aureus (SA), while Panton-Valentine leucocidin (PVL) is a toxin secreted by SA. This toxin is reported to be a virulence factor in invasive SA infections, whereas its precise role is still controversial depending on the infection site. We herein present a case of pyomyositis caused by Panton-Valentine leukocidin-secreting SA, with abdominal wall involvement, in a 1-year-old boy from a tropical country who was spending his holiday in Belgium.