What is the mening of "ve'al Safam Ya'ateh"?
Rashi: It means that the Metzora must cover his head down to his moustache like an Aveil. 1
Targum Yonasan: It also means that he must keep outside the border of the town. 2
Why did he have to call out 'Tamei Tamei!'
Rashi and Targum Yonasan: To warn people to keep away from him, to avoid becoming Tamei by touching him.