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MB3 188b: Removing Warts or Skin and Erasing Ink on Shabbos (340:2-3)
Cutting off warts is prohibited on Shabbos.
Removing cuticles on Shabbos (with/without a kli).
The melacha of erasing on Shabbos is erasing enough to be able to write two letters
Removing ink from your hands on Shabbos.