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.