Blast-pressure effect includes a positive-pressure phase and a negative-pressure phase.
Moves rapidly from the point of origin of the<unk>  pushing the air away from it and delivering violent force to everything in its path.
A vacuum/suction phase, which accounts for much of the debris near the area of greatest damage.
Explosions
Billing
Anal tags
Body packing
Dermatologic nomenclature
Formulas
LLSA Readings 
Perianal block