TT #142 · Parshas Tazria · Aliyah 2 · Passuk 16
English: But if the raw flesh again turns white and the person comes to the priest.
Chabad.org — Chumash, English translation + Rashi for Vayikra 13:16
Torah Temimah cites Sifra (Toras Kohanim) for the status of extremities that were exposed and then covered again.
Sifra — Vayikra 13, Midrash Sefer
English: “Or if the living flesh turns again” teaches that exposed extremities which became covered again are clean.
Textual derivation
This verse teaches that extremities that were exposed and then became covered again are considered pure.