Why does the Torah insert the (otherwise superfluous) word "Kis'sah ha'Tzara'as Es Kol Besaro"?
Sifra: To teach us that the Din P'richah extends to all appearances of Nega'im - and not exclusively to Se'eis. 1
Refer also to 13:12:0.2:1. See also ha'Torah ve'ha'Mitzvah.
What is the word "Kol Besaro"coming to include in the Din of P'richah?
Sifra: It includes where the Tzara'as spread to a. in between the fingers and the toes; b, any location of flesh and skin that is subject to Nega'im. 1
See ha'Torah ve'ha'Mitzvah.
What is the word "Tahor Hu" coming to preclude?
Sifri: It preludes P'richah that spreads from Taharah - if the Metzora comes initially covered with Tzara'as - whom the Kohen declares Tamei.