Parashas Metzora · Passuk 15:07
Chabad.org — English translation + Rashi
Torah Temima points to Toras Kohanim.
English: “The flesh of the zav” — the flesh, and not excrement upon him, and not a kolkalos upon him.
Flesh proper, not external matter
Chazal limit contact impurity to the zav’s flesh itself, excluding waste or certain coverings on him.