"between your eyes": On the height of your head or between your eyes, literally? It is, therefore, written (Devarim 14:1) "You shall not make baldness between your eyes." Just as there, on the height of the head, so, here, on the height of the head. R. Yehudah says: Since Scripture prescribes tefillin for both the arm and the head. Just as the arm is a place which is susceptible of (only) one type of (leprosy) uncleanliness (i.e., a white hair), so the head (must be) a place which is susceptible of (only) one type of uncleanliness (i.e., a yellow hair — to exclude "between the eyes" [literally], which is susceptible of both types of uncleanliness).