TT #297 · Parshas Tazria · Aliyah 7 · Passuk 57
English: If it appears again in the garment, warp or woof, or any leather article, it is a spreading lesion; you shall burn it in fire.
Torah Temimah cites Sifra (Toras Kohanim) for marking the original site when a lesion may recur.
Sifra — Vayikra 13, Midrash Sefer
English: The word “again” refers to the same place; the Sifra teaches that a patch is placed over the affected area.
Textual derivation
The recurrence is assessed at the original site, which is marked with a patch.