Charles Ellicott Commentary Leviticus 13:52

"And he shall burn the garment, whether the warp or the woof, in woollen or in linen, or anything of skin, wherein the plague is: for it is a fretting leprosy; it shall be burnt in the fire." — Leviticus 13:52 (ASV)

He shall therefore burn. —As this contamination could never be eradicated from fabrics, garments that had once become leprous had to be burned.