'Spreading' in the Bible

The priest shall look, and if the scab has spread on the skin, then he shall pronounce him unclean; it is leprosy.

And the priest shall examine him on the seventh day; if it is spreading farther on the skin, then the priest shall pronounce him unclean; it is leprosy.

If it still appears in the garment, either in the warp or in the woof, or on anything made of leather, it is an outbreak; you shall burn the marked part in the fire.

then the priest shall come and look again, and if the mark has spread in the house, it is a malignant leprosy in the house; it is [ceremonially] unclean.