Leviticus 13:11

7 But if the rash spreads further on his skin after he has shown himself to the priest for his cleansing, he must present himself again to the priest.

8 The priest will reexamine him, and if the rash has spread on the skin, the priest must pronounce him unclean; he has a skin disease.

9 When anyone develops a skin disease, he must be brought to the priest.

10 The priest will examine him, and if there is a white swelling on the skin that has turned the hair white, and there is raw flesh in the swelling,

11 it is a chronic skin disease and the priest must pronounce him unclean. He need not isolate him, for he is unclean.

12 But if the skin disease breaks out all over his skin so that it covers all the skin of the infected person from head to foot, as far as the priest can see,

13 the priest shall examine him, and if the disease has covered his entire body, he is to pronounce the infected person clean. Since it has all turned white, he is clean.

14 But whenever raw flesh appears on someone, he will be unclean.

15 When the priest sees the raw flesh, he must pronounce him unclean. The raw flesh is unclean; it is a skin disease.

Read all of Leviticus 13