Leviticus 13:40-44

“Now if a man loses the hair of his head, he is only bald; he is clean.

And if his head becomes bald at the front and sides, he is bald on the forehead; he is clean.

But if on the bald head or the bald forehead there occurs a reddish-white infection, it is leprosy breaking out on his bald head or on his bald forehead.

Then the priest shall look at him; and if the swelling of the infection is reddish-white on his bald head or on his bald forehead, like the appearance of leprosy in the skin of the body,

he is a leprous man, he is unclean. The priest must pronounce him unclean; his infection is on his head.