Incision and debridement. Unless it's incised, it's near impossible to mechanically debride. Seen this with necrotic decubs- no drainage to be found- just "crust" and nasty purpley-black stuff.
Incision and drainage? Yeah- that, too. And have had that
done-- but don't remember what they called it- LOL
- just I & D. And with an infection, this sounds reasonable.
Irrigation and debridement??? Only if using sulfuric acid
You'd need some serious psi to blow off dead tissue, which would cause more damage - and if it's just hanging
there, you'd more likely just need a good sterile swabbing