botfly - monster botfly larvae in eye, nose, arms, back.
the botfly occasionally uses humans to host its larvae.
squeezing the larvae out is not recommended as it can cause the larvae to rupture; their bodily fluids have been known to cause severe anaphylactic shock. the botfly occasionally uses animal to host its larvae.

huge botfly maggot removed from head.

the botfly larva can easily be killed by taking away its air supply -- by putting vaseline or similar on the skin where the lump is but then you still have to extract the larva.