TT #192 · 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.
Chabad.org — Chumash, English translation + Rashi for Vayikra 13:30
Torah Temimah cites Sifra (Toras Kohanim) for Rabbi Akiva’s definition of the required thinness of the hair.
Sifra — Vayikra 13, Midrash Sefer
English: According to Rabbi Akiva, “thin” here means hair that is short and defective.
Textual derivation
Rabbi Akiva interprets the word as describing the hair’s short, defective condition, rather than its color alone.