Leviticus 13:25

13:25 the priest must examine it, and if the hair has turned white in the bright spot and it appears to be deeper than the skin, it is a disease that has broken out in the burn. The priest is to pronounce the person unclean. It is a diseased infection.

Leviticus 13:55

13:55 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.