(Mishnah): [During Pesach] One may not soak bran for chickens, but one may Cholet (put it in or pour over it boiling water - which prevents leavening).

A woman may not soak bran that she carries to the bathhouse [to rub on her skin], but she may rub dry bran on her skin.

One may not chew wheat and put it on a wound as it becomes Chametz.

(Beraisa - R' Yishmael quoting R' Yosi): What is Me'eisa (a case in Maseches Challah 1,6, where Beis Shammai and Beis Hillel disagree over whether Challah must be taken from it)? One who pours hot water into flour (according to Beis Hillel, the dough is obligated in Challah as it has become Chametz). Chalita is pouring flour into hot water.

Question: Here, our Mishnah permits both hot water into coarse bran or vice-versa (indicating that it does not become Chametz).

Answer: The coarse bran is fatty, which prevents it from becoming Chametz.

Question: If a bandage (made from chewed wheat or barley seeds) became rotten, one Beraisa taught that he is required to destroy it and one Beraisa taught that he is exempt?!

Answer: One is required to destroy it if it became Chametz before it rotted but one is exempt if it rotted before it became Chametz.