摘要
To the Editor:Vitiligo is an asymptomatic but cosmetically disfiguring disorder that results in depigmented patches in the skin.The prevalence of vitiligo was 0.56%in China according to our study in 2008.[1]Based on clinical features,vitiligo can be classified into four subtypes:segmental(SV),non-segmental(NSV),mixed,and unclassified vitiligo.It also can be divided into active and stable phases according to the disease activity.[2]Koebner’s phenomenon(KP),also known as the isomorphic response,had been defined as the development of new lesions of a dermatosis over the sites of mechanical trauma.Unlike other disease(such as psoriasis),KP in vitiligo is related to daily activities,especially to chronic friction.The Vitiligo European Task Force(VETF)has recently updated the definition and classification of KP for vitiligo.[3]
