Read Leviticus 13:57 Using Other Translations
And if it appear still in the garment, either in the warp, or in the woof, or in any thing of skin; it is a spreading plague: thou shalt burn that wherein the plague is with fire.
Then if it appears again in the garment, in the warp or the woof, or in any article made of skin, it is spreading. You shall burn with fire whatever has the disease.
If the spot later reappears on the clothing, the fabric, or the leather article, the mildew is clearly spreading, and the contaminated object must be burned up.