患儿男,2个月,主因“发现头面部红斑1月余、头围增大10天余”入院,患儿1月余前(生后3周左右)无明显诱因出现头面部红斑,开始为米粒大小红斑,压之褪色,后逐渐增大,发展为铜钱样大小的环形红斑,并扩展至胸部。家属诉患儿平时无抓挠红斑、不伴脱发,无典型面部蝶形红斑、无明显毛细血管扩张、无发热、未予诊治。10余天前患儿家属发现患儿头围进行性增大,具体数值未测,无嗜睡、无喷射性呕吐。患儿系第4胎第2产,孕38周,剖宫产,出生体重3250 g,生后母乳喂养。其母妊娠 Children, male, 2 months, the main reason, “found the first facial erythema more than 1 month, head circumference increased more than 10 days ” admission, more than 1 month before the child (after 3 weeks of life) no obvious incentive to head and face erythema , Began to erythema for the size of the rice, the pressure of fading, and then gradually increased to the size of the coin-shaped ring erythema, and extended to the chest. Family members usually have no scratching erythema in children with children, without hair loss, no typical facial butterfly erythema, no significant telangiectasia, no fever, no diagnosis and treatment. More than 10 days ago, children and their families found that children with head circumference increased, the specific values ​​were not measured, no lethargy, no ejection vomiting. The second child of the fourth child was born in the fetus, 38 weeks pregnant, cesarean section, birth weight 3250 g, breastfeeding after birth. The mother’s pregnancy