TT #137 · Parshas Tazria · Aliyah 2 · Passuk 14
English: But as soon as raw flesh appears on them, they shall be impure.
Chabad.org — Chumash, English translation + Rashi for Vayikra 13:14
Torah Temimah cites Sifra (Toras Kohanim) for the same seven-day protection during a festival.
Sifra — Vayikra 13, Midrash Sefer
English: Likewise, during a festival he is given all seven days of the festival.
Textual derivation
The same protection applies during a festival: the seven days of the festival are granted.