Leviticus 13:14

it is a chronic leprosy in the skin of his body, and the priest shall pronounce him unclean. He shall not isolate him, for he is already unclean.

“If the leprosy breaks out all over the skin, and the leprosy covers all the skin of the infected person from his head even to his feet, as far as it appears to the priest,

then the priest shall examine him. Behold, if the leprosy has covered all his flesh, he shall pronounce him clean of the plague. It has all turned white: he is clean.

The priest shall examine the raw flesh, and pronounce him unclean: the raw flesh is unclean. It is leprosy.

Or if the raw flesh turns again, and is changed to white, then he shall come to the priest.

The priest shall examine him. Behold, if the plague has turned white, then the priest shall pronounce him clean of the plague. He is clean.