[Zigûr]

We know from The Lord of the Rings that Orcs were quite skilled healers. When the Uruk-hai need Pippin to walk, "Uglúk thrust a flask between his teeth and poured some burning liquid down his throat: he felt a fierce glow flow through him. The pain in his legs and ankles vanished. He could stand."
Merry receives slightly further care:
"Uglúk pulled him into a sitting position, and tore the bandage off his head. Then he smeared the wound with some dark stuff out of a small wooden box."
It goes on to say:
"He was healing Merry in orc-fashion; and his treatment worked swiftly. When he had forced a drink from his flask down the hobbit's throat, cut his leg-bonds, and dragged him to his feet, Merry stood up, looking pale but grim and defiant, and very much alive. The gash in his forehead gave him no more trouble, but he bore a brown scar to the end of his days."
As we are told in The Hobbit, Orcs "make no beautiful things, but they make many clever ones." I would argue from Merry and Pippin's treatment that such a description extends very accurately to their medicine.
How they treated their wounded fellows is something I will leave to others.