[If] someone had a baheres and it was cut off, it [becomes] tahor. [If] he cut it off intentionally, R’ Eliezer says: When another nega appears and he becomes tahor from it. The Sages say: Until it covers him completely. [If] it was on the tip of the foreskin, he shall circumcize [anyway].

That which spreads completely from a tamei becomes tahor. [If] the extremities return [to normal appearance], he becomes tamei until his baheres becomes smaller than a gris. [That which spreads completely] from a tahor becomes tamei. [If] the extremities return [to normal appearance], he remains tamei until his baheres returns to the way it was.