患儿,女,１岁。因肛周脱屑２天而入院,入院前２天无明显诱因出现肛周脱屑,不发热、无腹泻等不适感,平素体健,既往无过敏史,家族无特殊疾病。体格检查:神志清,无贫血貌,无皮疹,淋巴结无肿大,心肺正常。实验室检查:血红蛋白１３ｇ／Ｌ，白细胞１３Ｘ１０９／Ｌ，中性粒细胞:８０% Children, female, 1 year old. Perianal desquamating for 2 days and admission, 2 days before admission there is no obvious incentive to perianal scaling, no fever, no diarrhea and other discomfort, usually no health, no history of allergies, no special family disease. Physical examination: Conscious, anemic appearance, no rash, no swelling of the lymph nodes, normal heart and lung. Laboratory tests: hemoglobin 13g / L, white blood cells 13X109 / L, neutrophils: 80%