Selmanowitz V J, Krivo J M
Br J Dermatol. 1975 Oct;93(4):371-7. doi: 10.1111/j.1365-2133.1975.tb06510.x.
The natural pigmentary demarcation boundaries of the skin can be classified as: Group A--lines along the upper limb with variable trans-pectoral extension; Group B--lines along the lower limb; Group C--paired lines in median or paramedian course on the chest with midline abdominal extension; Group D--posteromedian demarcation; and Group E--bilaterally symmetrical, obliquely oriented hypopigmented macules on the chest. Groups A and C are the most distinct and occur in both Negroes and Japanese.
A组——沿上肢的线，有可变的经胸延伸；B组——沿下肢的线；C组——胸部正中或旁正中走行的成对线，向腹部中线延伸；D组——后正中分界；以及E组——胸部双侧对称、斜向的色素减退斑。A组和C组最为明显，在黑人和日本人中均有出现。
