“Tazria” means “to bring seed, give birth.” It begins with the “niddah” rules, or how a woman is unclean for a certain period after giving birth. The rest of the portion then deals with how lepers are to be isolated and pronounced clean by the priests before being allowed to rejoin Israel.
“Metzora” or more precisely “Ha Metzora” means “The Leper,” and the portion concerns primarily how a leper gets pronounced clean by the priests, how he demonstrates he has been cleansed from the disease. The previous Torah portion (Tazria) concerned states of impurity and isolation for women who have just given birth and lepers. This portion deals with how to get the lepers clean again. It then takes an interesting turn to discuss what happens when a whole house becomes unclean before ending with other purity rules for men and women.