Part of the purification process of a Metzora is a full haircut (Vayikra 14:9).
וְהָיָה בַיּוֹם הַשְּׁבִיעִי יְגַלַּח אֶת־כָּל־שְׂעָרוֹ אֶת־רֹאשׁוֹ וְאֶת־זְקָנוֹ וְאֵת גַּבֹּת עֵינָיו וְאֶת־כָּל־שְׂעָרוֹ יְגַלֵּחַ וְכִבֶּס אֶת־בְּגָדָיו וְרָחַץ אֶת־בְּשָׂרוֹ בַּמַּיִם וְטָהֵר׃ On the seventh day he shall shave off all his hair—of head, beard, and eyebrows. When he has shaved off all his hair, he shall wash his clothes and bathe his body in water; then he shall be clean.
Although there are plenty other peculiar parts of this purification process (red wool, hyssop, cedar, etc.), why does the Metzora's tahara specifically include a massive haircut? It seems more similar to the inauguration of the Levi'im or the final sacrifice of the Nazir, who seem to stand at the opposite spectrum of this individual who is considered an Av HaTumah.