Leviticus 13:9-11

When the disease of a leper is seen on a man, let him be taken to the priest; And if the priest sees that there is a white growth on the skin, and the hair is turned white, and there is diseased flesh in the growth, It is an old disease in the skin of his flesh, and the priest will say that he is unclean; he will not have to be shut up, for he is clearly unclean.