Treatment: 1, bed rest, reduce activities. 2, pay attention to the child’s lower limbs to keep warm (not mentioned in the literature, but I clinically found that it is related to localized cold,). 3, local physical therapy: red light treatment, TDP treatment, recommended twice a day, 20 minutes each time. 4. Dermal traction is recommended for severe cases. 5.Antiviral treatment (mostly not needed). Complications: good prognosis, literature reports problems with femoral head necrosis.