A baheres the size of a gris has a strip [of nega] extending from it. If [the strip] is two hairs wide, it connects the baheres to white hair or to expansion, but not to a section of living skin. Two beharos have a strip [of nega] connecting them. If [the strip] is two hairs wide, they combine, and if not, they do not combine.

A baheres the size of a gris contains living skin the size of a lentil, and on the living skin there is white hair. If the healthy skin disappeared, [the baheres] is tamei because of white hair. [If] the white hair fell out, [the baheres] is tamei because of living skin. R’ Shimon considers it tahor because the baheres did not cause [the hair] to change color. A baheres, and the living skin it contains, together equal the size of a gris, and there is white hair inside the baheres. [If] the living skin disappeared, it is tamei because of the white hair. [If] the white hair fell out, it is tamei because of the living skin. R’ Shimon considers it tahor because [the hair] was not changed by a baheres the size of a gris. However, he agrees that if there is a gris [of nega] where the white hair [grows], it is tamei.