18-19 If you have a sore that either swells or turns reddish-white after it has healed, then you must show it to a priest.
20 If he discovers that the hair in the infected area has turned white and that the infection seems more than skin deep, he will say, “This is leprosy—you are unclean.”
21 But if the white area is only on the surface of the skin and hasn't got any worse, and if the hair in it hasn't turned white, he will make you stay away from everyone else for seven days.
22 If the sore begins spreading during this time, the priest will say, “You are unclean because you have a disease.”
23 But if it doesn't spread, and only a scar remains, he will say, “You are now clean.”
24 If you have a burn that gets infected and turns red or reddish-white,
25 a priest must examine it. Then if he discovers that the hair in the infected area has turned white and that the infection seems more than skin deep, he will say, “The burn has turned into leprosy, and you are unclean.”