TT #143 · 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 rule’s application even when exposure and re-covering recur repeatedly.
Sifra — Vayikra 13, Midrash Sefer
English: Even if this occurs a hundred times, the verse’s repetition teaches that it remains within the rule.
Textual derivation
The same rule applies even if the extremities become exposed and covered again many times.