Negaim 8:4-5

Negaim 8:4

Whenever tzaraas breaks out and covers the ends of one’s limbs, rendering the ritually unclean clean, if the limbs revert to their pre-tzaraas condition, they are once again ritually unclean. Whenever the ends of one’s limbs revert to their pre-tzaraas condition rendering the ritually clean unclean, if they are covered with tzaraas again, they become ritually clean again. If they again become uncovered by tzaraas, they return to a state of impurity. This can go back and forth even 100 times.

Negaim 8:5

Any part of the body that can be rendered impure by a white spot can prevent breaking out all over, while any part that can’t be rendered impure by a white spot doesn’t prevent breaking out all over, as follows: if tzaraas broke out all over except for the head or beard, or on a boil, burn or blister that's still forming, and the head or beard then became bald or the boil, burn or blister scarred over, he is ritually clean. If tzaraas broke out all over except for a spot the size of half a lentil near the head, beard, boil, burn or blister, and the head or beard then became bald or the boil, burn or blister scarred over, then even if the place of the healthy flesh becomes a white spot, one is unclean until it breaks out all over his body.