TT #240 · Parshas Tazria · Aliyah 7 · Passuk 45
English: As for the person afflicted with tzaraas, his garments shall be torn, his head shall be unkempt, he shall cover his upper lip, and he shall call out, “Impure! Impure!”
Chabad.org — Chumash, English translation + Rashi for Vayikra 13:45
Torah Temimah cites Megillah 8b for distinguishing a confirmed metzora, whose status depends on the lesion, from one whose status depends on the passage of time.
E-Daf — Megillah 8b · Shas.org
E-Daf — Megillah 8b · Shas.org — Megillah 8b (PDF)
English: “The metzora who has the affliction in him” refers to one whose status depends on the affliction in the body, excluding a case whose status depends on the prescribed days.
Textual derivation
A confirmed metzora’s status depends on the lesion itself; a quarantined metzora’s status may instead be resolved by the passage of the prescribed period.