Negaim 7:1-2

Negaim 7:1

The following white spots are ritually clean: ones that a person had before the Torah was given, that a non-Jew had when he converted, that a baby had when it was born, that were in a fold and became exposed, and that were on the head or beard, or a boil, a burn or a blister that is still forming. If the head or beard go bald, or the boil, burn or blister scar over, they are ritually clean. If the white spot was on the head or beard before they grew hair and they subsequently grew hair and then became bald, or if the white spot was on the body before the boil, burn or blister scarred and then they scarred over or were healed, Rabbi Eliezer ben Yaakov says they’re unclean because they were unclean at the outset and at the end; the Sages, however, declare them clean.

Negaim 7:2

Let’s say that a white spot changed color, either leniently or stringently. Leniently would be if it was white like snow and it turned white like the plaster of the Temple, or if it was white like wool or like an egg skin and it became like the secondary shade of wool white or of snow white. Stringently would be if it was the color of an egg skin and it became like white wool, the plaster of the Temple or snow. Rabbi Elazar ben Azariah declares these clean. Rabbi Elazar Chisma says that if the change is towards leniency, it’s clean but if it’s towards stringency, it must be inspected as a new spot. Rabbi Akiva says that whether the change is towards leniency or stringency, it must be inspected as a new spot.