Facial palsy is a rare complication of infectious mononucleosis of Epstein-Barr virus infection, which can be easily overlooked by clinicians if one is unnoticed about it. We report a 2 year and 11 month old boy who was diagnosed by facial nerve palsy caused by Epstein-Barr virus infection. Pseudothrombocytopenia was also associated with him. Steroid (prednisolone 2mg/kg) was administered daily for 2 weeks and then maintained with alternative tapering schedule (2mg/kg at once QOD) in order to decompress facial nerve. He was completely recovered at 2 months of follow-up.