Piecing together the puzzle of cutaneous mosaicism
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More than a century ago, the lines of Blaschko were first described by German dermatologist Alfred Blaschko, based on the observation of patterned skin lesions that were linear on the extremities, S-shaped on the anterior trunk, and V-shaped on the back
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https://www.ncbi.nlm.nih.gov/pmc/articles/PMC526027/