Leviticus 13:18-13:39

When an inflammation appears on the skin of one's body and it heals, and a white swelling or a white discoloration streaked with red develops where the inflammation was, he shall present himself to the priest. If the priest finds that it appears lower than the rest of the skin and that the hair in it has turned white, the priest shall pronounce him unclean; it is a leprous affection that has broken out in the inflammation. But if the priest finds that there is no white hair in it and it is not lower than the rest of the skin, and it is faded, the priest shall isolate him for seven days. If it should spread in the skin, the priest shall pronounce him unclean; it is an affection. But if the discoloration remains stationary, not having spread, it is the scar of the inflammation; the priest shall pronounce him clean. When the skin of one's body sustains a burn by fire, and the patch from the burn is a discoloration, either white streaked with red, or white, the priest shall examine it. If some hair has turned white in the discoloration, which itself appears to go deeper than the skin, it is leprosy that has broken out in the burn. The priest shall pronounce him unclean; it is a leprous affection. But if the priest finds that there is no white hair in the discoloration, and that it is not lower than the rest of the skin, and it is faded, the priest shall isolate him for seven days. On the seventh day the priest shall examine him: if it has spread in the skin, the priest shall pronounce him unclean; it is a leprous affection. But if the discoloration has remained stationary, not having spread on the skin, and it is faded, it is the swelling from the burn. The priest shall pronounce him clean, for it is the scar of the burn. If a man or a woman has an affection on the head or in the beard, the priest shall examine the affection. If it appears to go deeper than the skin and there is thin yellow hair in it, the priest shall pronounce him unclean; it is a scall, a scaly eruption in the hair or beard. But if the priest finds that the scall affection does not appear to go deeper than the skin, yet there is no black hair in it, the priest shall isolate the person with the scall affection for seven days. On the seventh day the priest shall examine the affection. If the scall has not spread and no yellow hair has appeared in it, and the scall does not appear to go deeper than the skin, the person with the scall shall shave himself, but without shaving the scall; the priest shall isolate him for another seven days. On the seventh day the priest shall examine the scall. If the scall has not spread on the skin, and does not appear to go deeper than the skin, the priest shall pronounce him clean; he shall wash his clothes, and he shall be clean. If, however, the scall should spread on the skin after he has been pronounced clean, the priest shall examine him. If the scall has spread on the skin, the priest need not look for yellow hair: he is unclean. But if the scall has remained unchanged in color, and black hair has grown in it, the scall is healed; he is clean. The priest shall pronounce him clean. If a man or a woman has the skin of the body streaked with white discolorations, and the priest sees that the discolorations on the skin of the body are of a dull white, it is a tetter broken out on the skin; he is clean.