Supplementary material for JAAD Research Letter: 'Utility of dermoscopy in distinguishing vitiligo from other hypopigmenting disorders: a cross-sectional analysis'

Supplementary Figure 1. A. Dermoscopy of a vitiligo lesion showing depigmented background, completely absent pigment network, perifollicular retention of pigment, leucotrichia, vascular structures as red dots; and lack of discernibility of eccrine openings, discernible in other areas (black circle) B. Dermoscopic features of nevus depigmentosus showing intermediate margin with background hypopigmentation and faint pigment network present throughout the lesion, with lack of surface, vascular or other changes C. Dermoscopy of ash-leaf macule showing characteristic patchy pigment network (‘ALM-like’) with sharply demarcated islands of normal pigment network (blue arrow) within a depigmented lesion D. Dermoscopy of pityriasis alba showing ill-defined hypopigmented lesion with faint pigment network present throughout the lesion and subtle erythema E. Dermoscopy of pityriasis versicolor showing hypopigmented background with presence of faint network, perifollicular hypopigmentation and fine grey-white scaling F. Dermoscopy of idiopathic guttate hypomelanosis showing well-defined lesion with depigmented background, complete absence of pigment network and brown outlined discernible eccrine openings (black arrows) (DL3 10x, polarized).

Supplementary table 1. Dermoscopic findings of vitiligo and comparison by activity of disease
Supplementary table 2. Dermoscopic features of non-vitiligo lesions (nevus depigmentosus, ash-leaf macules, pityriasis alba, idiopathic guttate hypomelanoses, pityriasis versicolor)

补充图1。A. 白癜风皮损皮肤镜成像：可见色素脱失背景，完全无色素网（Pigment Network），毛囊周围色素潴留，毛发变白，血管结构表现为红色点状改变；汗孔无法辨识，但在其他区域可见（黑色圆圈标注）。
B. 脱色素痣皮肤镜特征：皮损边界呈过渡型，背景为色素减退，全皮损可见淡色素网，无表皮、血管或其他异常改变。
C. 叶状斑皮肤镜成像：特征性表现为斑驳状色素网（“ALM样”），色素脱失皮损内可见边界清晰的正常色素网岛（蓝色箭头标注）。
D. 白色糠疹皮肤镜成像：可见边界不清的色素减退皮损，全皮损可见淡色素网，伴轻度红斑。
E. 花斑癣皮肤镜成像：可见色素减退背景，存在淡色素网，伴毛囊周围色素减退及细灰白色鳞屑。
F. 特发性点状色素减退症皮肤镜成像：可见边界清晰的皮损，呈色素脱失背景，完全无色素网，可见褐色轮廓的可辨识汗孔（黑色箭头标注）（DL3 10倍放大，偏振光模式）。

补充表1. 白癜风皮肤镜表现及疾病活动性相关对比
补充表2. 非白癜风皮损的皮肤镜特征（脱色素痣、叶状斑、白色糠疹、特发性点状色素减退症、花斑癣）