Rationale:Stevens–Johnson syndrome (SJS) is an acute blistering disease of the skin and mucous membranes. SJS in children is not common but potentially serious disease. But the epidemiology of SJS in China is not well defined.Patient concerns:A 6-year-old boy was initially diagnosed as pneumonia admitted to hospital after admission, and the body appears red rash with blisters, skin damage, lip debaucjed, repeated high fever, and rapid progression.Diagnoses:SJS often results from an allergy reaction response to a range of drugs. It is a clinical diagnosis suggested by fever and malaise followed by an extensive painful, nonblanching, macular rash that commonly progresses to blistering or sloughing, and mucositis.Interventions:The boy was treated with continuous renal replacement therapy, anti-infection therapy, high-dose glucocorticoid treatment, and symptomatic treatment.Outcomes:The patient was recovered after 33 days of treatment.Lessons:The current treatment is mainly symptomatic treatment, and for the patient, it is important to make skin care related well, included early out blisters at effusion, reducing skin ulceration of the mucosa area, keeping skin clean, removing mucosa secretion and blood clots, doing eye care related, preventing the complications, ensuring adequate intake of nutrition and warm and so on.