背景：白癜风是一种获得性的皮肤色素脱失性疾病。
BACKGROUND: Vitiligo is an acquired skin disorder caused by the disappearance of pigment cells from the epidermis.
目的白癜风是一种以皮肤色素脱失为主要表现的获得性、色素障碍性疾病。
Objective Vitiligo is an acquired disorder of depigmentation characterised by the loss of pigment from epidermis.
结果：2例患者的皮肤色素脱失处基底层均未见黑素颗粒，符合白癜风的病理改变；
Results: There was no melanin granule in basal cell layer in depigmented skin of 2 cases, which coincided in the pathogenic change of vitiligo.
白癜风是由于皮肤和毛囊的黑素细胞内酪氨酸系统的功能减退、丧失引起的，是一种以局限性或泛发性皮肤色素脱失为特征的疾病。
Vitiligo is a condition in which the tyrosine system in pigment cells are destroyed , resulting in irregularly shaped white patches on the skin.
白癜风是由于皮肤和毛囊的黑素细胞内酪氨酸系统的功能减退、丧失引起的，是一种以局限性或泛发性皮肤色素脱失为特征的疾病。
Vitiligo is a condition in which the tyrosine system in pigment cells are destroyed , resulting in irregularly shaped white patches on the skin.
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