Blaschko’s lines – Dermatology MCQ

Blaschko’s lines represent?

A. Lines of development
B. Dermatomes
C. Lines along blood vessels
D. Lines along lymphatics

Correct answer : A. Lines of development

Blaschko’s lines

  • Blaschko’s lines are invisible developmental lines of the skin
  • They are thought to represent the pathways of  epithelial migration and proliferation in the foetus
  • These were first demonstrated by German dermatologist Alfred Blaschko in 1901.
  • They do not correspond to the path of vessels / nerves / lymphatics
  • Many skin lesions follow Blaschko’s lines. eg: Incontinentia pigmenti, Linear lichen planus, Lichen striatus Naevus achromicus

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