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This is the sickening moment a giant black cyst on a man's back erupts with pus during a gruesome operation.

The huge dark-coloured growth sits very close to the patient's spine.

Doctors initially seem to be trying to crack the spot open with some kind of blow torch.

Once they soften the crown of the cyst, the set to work squeezing out the fluid from inside.

And it is, frankly, disgusting.

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By then end of the operation the man is left with a gaping hole in the growth, which has now been emptied.

(Image: Brenda McBee)

Pink internal flesh can be seen through the wound.

The nauseating video emerges after a clip of a man's visit to the dentist which revealed his mouth coated in what appears to be thick, black slime which almost seems to be moving.

It's not clear exactly what the stomach-churning substance is, but some viewers thought they could even be maggots .