In elephantiasis maggots are bred in the sores (Act 12:23; Isa 14:11).
clods of dust - rather, a crust of dried filth and accumulated corruption (Job 2:7, Job 2:8).
my skin is broken and ... loathsome - rather, comes together so as to heal up, and again breaks out with running matter [Gesenius]. More simply the Hebrew is, “My skin rests (for a time) and (again) melts away” (Psa 58:7).