Basically, if there are remnants of a person left behind by the cenobites and blood is spilled in the same place, they can escape Hell through resurrection. In the Hellbound Heart, it was semen(he ejaculated during one of his experiences with the cenobites). The movies more or less imply it's leftover blood. I'll give you this one, it isn't explained in the first movie, but Hellbound implies it better with Julia being resurrected on the mattress where she died.
The other thing I thought was pretty clear. Frank says the blood brought him back and that he needs more. It's pretty easy to draw the conclusion that he's drinking his victims' blood. Plus the first three victims aren't skinned, just emaciated. He only steals Larry's skin because regenerating his body through blood was taking too long.
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