This list of mythical creatures that begin with this letter and I am constantly gathering information from each continent, and is continually being updated.
Shikome (Japanese)
Yomotsu-shikome, in Japanese mythology, was a hag sent by the dead Izanami to pursue her husband Izanagi, for shaming her by breaking promise not to see her in her decayed form in the Underworld (Yomi-no-kuni). Also recorded by the name Yomotsu-hisame, the name may have been a term referring collectively to eight hags, not just one.
The hag appears by the Yomotsu-shikome (or Ugly-Female-of-the-Underworld") name in the eldest Japanese chronicle Kojiki. But either eight demon-hags (female oni) or a woman/women named Yomotsu-hisame hunted after Izanagi according to the Nihon Shoki, which frequently gives different readings from alternative sources.