TT #116 · Parshas Tazria · Aliyah 2 · Passuk 10
English: It is chronic leprosy on the skin of his flesh, and the priest shall pronounce him impure; he shall not isolate him, for he is impure.
Chabad.org — Chumash, English translation + Rashi for Vayikra 13:11
Torah Temimah cites Sifra (Toras Kohanim) for the special rule for chronic tzaraas even when both white hair and healthy flesh are not present.
Sifra — Vayikra 13, Midrash Sefer
English: “Long-standing tzaraas”: one might think it is not impure until both white hair and a healthy-flesh patch are present; the verse says, “It is long-standing tzaraas.”
Textual derivation
The phrase “long-standing tzaraas” supplies a distinct route to impurity: a lesion established over time need not display both white hair and a healthy-flesh patch together.