 My friends swim no matter the season, but my moderate to severe plaque psoriasis can sometimes take me out of the moment. Now, thanks to Sky Rizzy and Clear Skin, count me in. With Sky Rizzy, Rizin Kizumab Rizza, a prescription-only 150-milligram injection for adults who are candidates for systemic or phototherapy. Three out of four people achieve 90% clear skin at four months.