TT #300 · 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 burning every piece removed from an affected garment.
Sifra — Vayikra 13, Midrash Sefer
English: The phrase “that has the lesion” teaches that all pieces torn from the affected article require burning.
Textual derivation
Burning applies to all pieces torn from the affected garment, not only to the largest piece or the piece that first displayed the lesion.