1)
What are the ramifications of the phrase "ke'Mar'eh Tzara'as Or Basar"?
1.
Rashi (on Pasuk 42): It implies a. that it requires one of the four appearances of Nig'ei Basar
1
and b. that it can last a maximum of two weeks.
2
2.
Ramban (on Pasuk 29-30): It implies that it is Metamei via a Michyah or spreading.
3
1
Rashi: Not like Nesakim, which do not require one of the four appearances. The Sifra cites the second reason that Rashi cites, but not the first one.
2
Rashi: Not like Sh'chin and Michvah, which last at most one week.
3
Ramban, citing Nega'im, 4:3: Refer also to 13:42:2:1..
