stretchmark

noun
  1. 1

    Any of a series of red, irregular stripes on the surface of the skin caused by rapid growth of the tissues lying just underneath. They usually appear as a result of pregnancy, puberty or obesity, but can also be caused by rapid muscle growth.

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Source: https://en.wiktionary.org/wiki/stretch%20mark, https://en.wiktionary.org/wiki/stretchmark