临床资料患儿男,4岁半,因腹泻6天,关节肿痛2天入院.6天前因腹泻呕吐伴低热,口服感冒清热冲剂及阿莫西林治疗.次日热退,腹泻呕吐好转,停用感冒清热冲剂,继续服阿莫西林.第3天全身出现淡红色斑丘疹及风团,伴瘙痒.第4天出现多个大小关节肿胀、疼痛. Clinical data Child, 4 years and a half, due to diarrhea 6 days, 2 days of joint swelling and pain hospitalization .6 days ago due to diarrhea and vomiting with fever, oral cold heat granules and amoxicillin treatment. The next day hot, diarrhea vomiting improved, Stop using cold heat granules, continue to take amoxicillin.The first day of the body appeared pink rash and wind group, accompanied by itching.At the fourth day there are multiple sizes of joint swelling, pain.