What does Leviticus 13:40 mean?

But if in his eyes the itch is arrested, and black hair has grown in it; the itch is healed, he is clean. The priest shall pronounce him clean.

“When a man or a woman has bright spots in the skin of the body, even white bright spots;

then the priest shall examine them; and behold, if the bright spots on the skin of their body are a dull white, it is a harmless rash, it has broken out in the skin; he is clean.

If his hair has fallen off from the front part of his head, he is forehead bald. He is clean.

But if there is in the bald head, or the bald forehead, a reddish-white plague; it is leprosy breaking out in his bald head, or his bald forehead.

Then the priest shall examine him; and, behold, if the rising of the plague is reddish-white in his bald head, or in his bald forehead, like the appearance of leprosy in the skin of the flesh,