Blaschko&;s lines implies the lines of
LINES OF BLASCHKO The lines of Blaschko are a pattern of lines on the skin that represent the developmental growth pattern during epidermal cell migration. The lines are distinguished from other morphological lines of the skin and do not represent vascular, lymphatic or nervous structures. Ref:- American osteopathic college of Dermatology
Melanocyte migration
Ectodermal cell migration
Mesodermal cell migration
Endodermal cell migration
Anatomy of skin