1)
What does "Porachas' mean?
1.
Rashi: "Porachas" means that what has regrown.
2)
How much of the Beged must be burned in the previous Pasuk and how much must be burned here?
1.
Rashi: In Pasuk 6, it is only the affected piece of garment that needs to be burned, whereas here it is the entire Beged.