MB3 166b: Bandages and Salves on Shabbos (328:25-28)

Reapplying a bandage that fell off on Shabbos and the melacha of ממחק (smoothing).

Cleaning out a wound on Shabbos and placing a bandage on a healed wound.

Removing a splinter and administering injections on Shabbos vis-a-vis causing a wound.