Leviticus 13:39-44

³⁹Then the priest is to see them: and if the white marks on their skin are not very bright, it is a skin disease which has come out on the skin; he is clean.

⁴⁰And if a man's hair has come out and he has no hair, still he is clean.

⁴¹And if the hair has gone from the front part of his head, so that he has no hair there, still he is clean.

⁴²But if, on his head or on his brow, where he has no hair, there is a red and white place, it is the disease of the leper coming out on his head or on his brow.

⁴³Then if the priest sees that the growth of the disease has become red and white on his head or on his brow where there is no hair, like the mark in the skin of a leper;

⁴⁴He is a leper and unclean; the priest is to say that he is most certainly unclean: the disease is in his head.