Leviticus 13:51-55

He shall then look at the mark on the seventh day; if the mark has spread in the garment, whether in the warp or in the woof, or in the leather, whatever the purpose for which the leather is used, the mark is a leprous malignancy, it is unclean.

So he shall burn the garment, whether it is the warp or the woof, in wool or in linen, or any article of leather, in which the mark occurs; for it is a leprous malignancy. It shall be burned in the fire.

“But if the priest looks, and indeed the mark has not spread in the garment, either in the warp or in the woof, or in any article of leather,

then the priest shall order them to wash the thing in which the mark occurs, and he shall quarantine it for seven more days.

After the article with the mark has been washed, the priest shall again look, and if the mark has not changed its appearance, even if the mark has not spread, it is unclean; you shall burn it in the fire, whether an eating away has produced bareness on the back or on the front of it.