患儿，女，３岁。一月前，不明原因的牙龈发红，肿胀。当地医院给抗感染，局部冲洗上药无好转，牙龈肿胀加剧并出现散在小溃疡，患儿流涎，疼痛不愿进食，体温３８ｏＣ，面色差，虽一直按牙龈炎治疗一直不愈，送来我院口腔科就诊。查全血常规，发现有中度贫血，疑及血液病转入 Children, female, 3 years old. A month ago, unexplained gum redness and swelling. Local hospital to fight infection, local irrigation on the drug did not improve, gingival swelling and the emergence of scattered small ulcers, children salivation, pain unwilling to eat, body temperature 38oC, looking bad, although has been treated by gingivitis has been unhealed, sent me Hospital stomatology treatment. Check the whole blood routine, found that moderate anemia, suspected and blood disease transferred