25 Nissan (Tazriah-Metzorah)

Why does it say (Vayikra 13,3) "Vira'ah hakohen es hanegah bior habasar... Vira'ahu hakohen vitimei osoh" (and the kohen should look at the tzara'as on the skin of his flesh... The kohen should look at it and declare it tamei.)? We already said the kohen should look at it in the beginning of the passuk!