Case description: Master K, a 9-month-old boy, presented with bilateral axillary swelling for 8 days. This swelling was insidious in onset and progressive, not associated with pain or redness. His past medical history was significant, as he had been hospitalized at 4 months of age. He experienced high fevers for 19 days, accompanied by erythematous rashes over his trunk, red lips, and red eyes without discharge. He showed marked thrombocytosis and leukocytosis along with elevated inflammatory parameters. During that time, he was suspected to have Multisystem Inflammatory Syndrome in Children (MIS-C) and was treated with oral steroids for 15 days, after which his fever subsided. Upon examination, he displayed bilateral pulsatile axillary swelling.