Leviticus 13:7-8, 22, 27, 36, 51

But if the scab should at all spread over the skin, after he has been seen by the priest for his cleansing, he shall be seen by the priest again. And if the priest sees that the scab has indeed spread on the skin, then the priest shall pronounce him unclean. It is leprosy.

and if it should at all spread over the skin, then the priest shall pronounce him unclean. It is a leprous sore.

And the priest shall examine him on the seventh day. If it has at all spread over the skin, then the priest shall pronounce him unclean. It is a leprous sore.

then the priest shall examine him; and indeed if the scale has spread over the skin, the priest need not seek for yellow hair. He is unclean.

And he shall examine the plague on the seventh day. If the plague has spread in the garment, either in the warp or in the woof, in the leather or in anything made of leather, the plague is an active leprosy. It is unclean.