TT #145 · Parshas Tazria · Aliyah 2 · Passuk 17
English: And the priest sees that the affected area has turned white, the priest shall pronounce the affected person clean; they are clean.
Chabad.org — Chumash, English translation + Rashi for Vayikra 13:17
Torah Temimah cites Sifra (Toras Kohanim) for the status of a person whose whole body is white from the outset.
Sifra — Vayikra 13, Midrash Sefer
English: “He is clean” means he is clean; one whose whole body is white at the outset is not clean but impure.
Textual derivation
The distinction is timing: a body that is white from the outset is not given the clean status that can apply after an earlier whole-body eruption later changes at the extremities.