TT #140 · Parshas Tazria · Aliyah 2 · Passuk 15
English: When the priest sees the raw flesh, he shall pronounce the person impure. The raw flesh is impure; it is tzaraas.
Chabad.org — Chumash, English translation + Rashi for Vayikra 13:15
Torah Temimah cites Sifra (Toras Kohanim) for cases in which impurity signs appear after earlier definitive rulings or isolation.
Sifra — Vayikra 13, Midrash Sefer
English: “He shall pronounce him impure” includes cases where a resolved lesion returns with living flesh, white hair, spreading, or after the observation period.
Textual derivation
The Sifra extends the impurity ruling to reappearance after the earlier cases it lists, including prior definitive rulings based on healthy flesh, white hair, spreading, or isolation.