Pigmentary demarcation lines

Abstract
SUMMARY: 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.