SLAYER will tour without guitarist JEFF HANNEMAN... after he suffered a nasty spider bite that gave him a flesh-eating disease called necrotizing fasciitis.  It's a rare infection in which a bacterial virus attacks skin, fat and body tissue.

If you REALLY want to be grossed out, Google "necrotizing fasciitis"... the pictures are hard to stomach.  So this is actually an appropriate disease for a guy who shreds on songs like "Piece By Piece", "Dead Skin Mask" and "Flesh Storm".

Slayer has decided to continue without him, mostly because of all the dates they've had to cancel over the past year or so because of singer TOM ARAYA'S illnesses. 

(There's no word when Jeff could be back.)