临床资料患儿,男,2岁。主因右足外侧褐色斑块2年,于2011年2月18日来院就诊。患儿出生后1周,家人发现其右足外侧有一褐色斑块,约黄豆大小,随年龄逐渐增大,无痛痒等不适。患儿为头胎足月顺产儿,母乳喂养,父母非近亲结婚,家族中无类似病史。体格检查:发育良好,智力正常,全身系统检查未见异 Clinical data children, male, 2 years old. Mainly because of the right lateral brown plaque for 2 years, on February 18, 2011 to the hospital. One week after the birth of the child, the family found that there was a brown plaque on the outside of the right foot. About the size of the soybean, it gradually increased with age and it did not cause itching. Children with full-term first-born fetus, breast-feeding, non-relatives marry their parents, no similar family history. Physical examination: well-developed, normal intelligence, no difference in systemic examination