Leviticus 13:7-17

7 But if the rash has spread after he has shown himself to the priest to be declared clean, he must show himself to the priest again.
8 The priest will examine him one more time, and if the rash has spread, the priest must declare him unclean. It is an infectious skin disease.
9 "If anyone has an infectious skin disease, he must be taken to the priest.
10 The priest will examine him. If there is a white sore that has turned the hair white, and if there is raw flesh in the sore,
11 he has a chronic skin disease. Without putting him in isolation, the priest must declare him unclean because he is unclean.
12 If skin disease develops and covers the whole person from head to foot (so far as the priest can see),
13 the priest will examine him. If the disease does cover his whole body, the priest must declare the diseased person clean. His body has turned white. The person is clean.
14 But if raw flesh appears, he will be unclean.
15 The priest will examine the raw flesh and declare him unclean. The raw flesh is unclean. It is an infectious skin disease.
16 But if the raw flesh turns white again, he must go to the priest.
17 The priest will examine him again, and if the diseased area has turned white, the priest must declare the diseased person clean. He is clean.