The priest must then examine it after the infection has been washed out, and if the infection has not changed its appearance even though the infection has not spread, it is unclean. You must burn it up in the fire. It is a fungus, whether on the back side or front side of the article.

and must slaughter it on the north side of the altar before the Lord, and the sons of Aaron, the priests, will splash its blood against the altar's sides.