胎记又名蒙古斑(mongolianspot)为先天性真皮黑素细胞增多症，因婴儿生来即有，故又名儿痣。组织学上可见黑素细胞停留在真皮深部，故又称真皮黑变病(dermalmelanosis)。蒙古斑可发生于身体的任何部位，以腰骶部及臀部多见。因黑素颗粒位于较深部位，在光线的Tyndall效应下，呈特殊性的灰青色或蓝色。随婴儿生长，蒙古斑色泽逐渐转淡，或消失，对机体亦无任何危害，可不作特殊治疗。...
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