STAGE ONE          The skin is not broken, but is red or discolored.  The   redness or change in color does not fade within 30 minutes   after pressure is removed.	STAGE TWO             The epidermis or topmost layer of the skin is broken,   creating a shallow open sore.  Drainage may or may not be   present.
STAGE THREE            The break in the skin extends through the dermis   [second  skin layer] into the subcutaneous and fat tissue.   The wound is deeper than in stage two.	STAGE FOUR           The breakdown extends into the muscle and can extend   as far down as the bone.  Usually lots of dead tissue and   drainage are present.