He's going through a bad/difficult/rough 'patch' [='spell'] right now.
The chair's original paint is still visible 'in patches'. [=in spots]
The doctor 'patched' him 'up', so he's going to be as good as new.
(..) There's ten thousand. Geese, villain? Soldiers, sir. Go, prick thy face and over-red thy fear, thou lily-livered boy. What soldiers, patch? The English force, so please you. Hang out our banners on the outward walls. The cry is still, "They come!" Our castle's strength will laugh a siege to scorn. (..)2015 Macbeth