- Blaschko’s lines, also called the Lines of Blaschko, are skin lines invisible under normal conditions. They become apparent when some diseases of the skin or mucosa manifest themselves according to these patterns: They follow a “V” shape over the back,”S” shaped whorls over the chest, stomach, and sides, and wavy shapes on the head.
- The lines are believed to trace the migration of embryonic cells.
- The stripes are a type of genetic mosaicism. They do not correspond to nervous, muscular, or lymphatic systems. The lines can be observed in other animals such as cats and dogs.
- German dermatologist Alfred Blaschko is credited for the first demonstration of these lines in 1901.
- They can often only be seen with ultraviolet light.