Metzora 5774

The Ramban from last week (13:47) explains that Tzara'as isn't a natural sickness, it is a miraculous phenomenon. When Bnei Yisroel are one with Hashem, His presence is upon them and gives them a favorable appearance to their bodies, clothing, and houses. But when Bnei Yisroel sins, they remove Hashem's presence from themselves. This results in a hideous mark on them and their possessions.