These parshiyot – Tazria and Metzora tell about the metzora. Chazal say that the word “Metzora” is a combination of the word “motzi ra – one who emits slander” [lit. spreading negative information], implying that tzara’at is retribution for one who slanders, since he spread derogatory information. But there is another meaning to tzara’at that a metzora suffers, as it is stated in Gemara about tzara’at [Berachot 5b]: It is nothing else but an altar of atonement. Suffering purifies a person from all evilness, since through suffering he is cleansed from all sin. This is the reason for the juxtaposition: “If a woman conceives … and on the eighth day, the flesh of his foreskin shall be circumcised” and following this is parashat Metzora, which signifies that just as through the mizvah of Brit Mila [circumcision] the child connects to the Covenant of Avraham Avinu, so too the suffering and pain that a person experiences because of his tzara’at removes all evilness from him and connects him to Hashem, since suffering is for the benefit of man and he should not despair when it comes upon him.
Source: Rabbi David Hanania Pinto
This shall be the law of the person afflicted with tzara'ath, on the day of his cleansing: he shall be brought to the kohen. [Metzora 14:2]
People have a tendency to make light of the sin of loshon hara, said the Dubno Maggid. They say to themselves: ''What are mere words? I am not harming my friend in any way by simply speaking about him.''
The Torah therefore requires that the metzora be brought to the Kohen, in order for him to witness what man's speech is capable of doing. With one word, the Kohen defines the status of the metzora, making him either pure or impure - such is the power of man's words!
Source: Rabbi Yisrael Bronstein