"ed during the past 12-month period0 Or rate as disfigurement of the head, face, or neck (DC 7800) or scars (DC's 7801, 7802, 7803, 7804, or 7805), depending upon the predominant disability. 7816 Psoriasis: More than 40 percent of the entire body or more than 40 percent of exposed areas affected, or; constant or near-constant systemic therapy such as corticosteroids or other immunosuppressive drugs" . . . .