Leviticus 13:2
"When someone has a swelling or rash or bright spot on his skin that could become an infectious skin disease, he must be brought to Aaron the priest or to one of his sons who is a priest.

Leviticus 13:8
The priest will examine him, and if the rash has spread on the skin, then the priest must pronounce him unclean; he has a skin disease.

Leviticus 13:10
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,