John Gill Commentary Leviticus 13:57

"and if it appear still in the garment, either in the warp, or in the woof, or in anything of skin, it is breaking out: thou shalt burn that wherein the plague is with fire." — Leviticus 13:57 (ASV)

And if it appear still in the garment, either in the warp, or in the woof, or in anything of skin After the piece has been rent out, in another part of the garment where before it was not seen: it [is] a spreading [plague] ; or leprosy; a flourishing one, as the word signifies, a growing and increasing one: you shall burn that in which the plague [is] with fire ; according to Aben Ezra, only that part in which the plague was; but Jarchi says the whole garment; with whom Ben Gersom seems to agree, who reads the words, you shall burn it, with that in which the plague is; the whole garment, skin, warp, or woof, along with the part in which the leprosy is.