What is "T'nuch Ozen"?
Rashi and Targum Yonasan: "T'nuch Ozen" is the middle part (the cartilage of the ear.
Targum Onkelos: It is the top part of the ear.
The Torah teaches only about putting blood on the Metzora. What is the source to collect blood in a Kli and put it on the Mizbe'ach?
Moshav Zekenim: "Ka'Chatas ha'Asham" returns it to the Klal of Ashamos (other than the Chidushim written about it).