'Spreading' in the Bible

If, however, the scab is spreading further on the skin after he has shown himself to the priest for his purification, then he must show himself to the priest a second time.

If it is spreading further on the skin, then the priest is to pronounce him unclean. It is an infection.

The priest must then examine it on the seventh day, and if it is spreading further on the skin, then the priest is to pronounce him unclean. It is a diseased infection.