TT #195 · Parshas Tazria · Aliyah 5 · Passuk 30
English: the priest shall examine the affliction. If its appearance is deeper than the skin and it contains thin yellow hair, the priest shall pronounce him unclean; it is a netek, tzaraas of the head or beard.
Torah Temimah cites Sifra (Toras Kohanim) for the exclusive application of netek impurity to the head and beard.
English: Scripture says, “It is a netek, the tzaraas of the head,” and concludes that the head and beard are subject only to the impurity of netakim.
Textual derivation
The verse assigns the head and beard to the netek category, excluding the ordinary baheres impurity rules in those locations.