Leprosy is a terrible form of skin disease, still common in dry climates, and highly contagious. Lepers were forbidden by the law to enter any walled city. If a stranger approached, the leper was obliged to cry "unclean." The disease was regarded as a living death, indicated by bare head, rent clothes, and covered lip. For the regulations concerning the treatment of lepers, see Lev. 13 and Lev. 14.