bulge:
Ausbeulung, Anschwellung, Wulst, Beule.
(A protrusion of the skin, where the skin is pushed outward by muscle, or by skin being stretched over the eyeball or bone)

bag:
Beutel, Tasche.
(Loose skin which wrinkles as it is gathered together or pushed; a bag remains loose, not taut; it may be per-manent, but will thicken or become larger or more prominent with certain actions)

pouch:
Taschenförmig, ähnlich bulge.
( A pocket-like shape, often protrudes like a bulge; also, may be permanent in some faces, but certain actions will make it more evident)