These hated things are long white or greenish grubs, equipped with nasty gnashing maws on one
end of their fat wormy bodies. Flesh grubs are commonly found in piles of carrion,rubbish, etc, feeding off any and all flesh they can find, living or decomposed, with an unnatural hunger and ferocity.
Flesh grubs instantly attach themselves to any flesh coming into contact with them, burrowing effortlessly into unprotected skin to eat the host, inside-out. Needless to say, the process is incredibly painful, and can only be countered by the direct application of fire to the affected area