Leviticus 13:2-12

2 If any of you have a sore on your skin or a boil or an inflammation which could develop into a dreaded skin disease, you shall be brought to the Aaronite priest.
3 The priest shall examine the sore, and if the hairs in it have turned white and the sore appears to be deeper than the surrounding skin, it is a dreaded skin disease, and the priest shall pronounce you unclean.
4 But if the sore is white and does not appear to be deeper than the skin around it and the hairs have not turned white, the priest shall isolate you for seven days.
5 The priest shall examine you again on the seventh day, and if in his opinion the sore looks the same and has not spread, he shall isolate you for another seven days.
6 The priest shall examine you again on the seventh day, and if the sore has faded and has not spread, he shall pronounce you ritually clean; it is only a sore. You shall wash your clothes and be ritually clean.
7 But if the sore spreads after the priest has examined you and pronounced you clean, you must appear before the priest again.
8 The priest will examine you again, and if it has spread, he shall pronounce you unclean; it is a dreaded skin disease.
9 If any of you have a dreaded skin disease, you shall be brought to the priest,
10 who will examine you. If there is a white sore on your skin which turns the hairs white and is full of pus,
11 it is a chronic skin disease. The priest shall pronounce you unclean; there is no need to isolate you, because you are obviously unclean.
12 If the skin disease spreads and covers you from head to foot,
Scripture taken from the Good News Translation - Second Edition, Copyright 1992 by American Bible Society. Used by Permission.