Reference for Negaim 3:4

הַשְּׁחִין וְהַמִּכְוָה מִטַּמְּאִין בְּשָׁבוּעַ אֶחָד וּבִשְׁנֵי סִימָנִין, בְּשֵׂעָר לָבָן וּבְפִסְיוֹן. בְּשֵׂעָר לָבָן, בַּתְּחִלָּה, בְּסוֹף שָׁבוּעַ, לְאַחַר הַפְּטוּר. וּבְפִסְיוֹן, בְּסוֹף שָׁבוּעַ, לְאַחַר הַפְּטוּר. וּמִטַּמְּאִין בְּשָׁבוּעַ אֶחָד, שֶׁהוּא שִׁבְעַת יָמִים:

[A <i>Nega</i> in the area of] a boil or a burn is made impure after a week or through two signs: white hair or expansion. Regarding white hair, [it causes impurity] initially, at the end of the week [of quarantine], or after the exemption. Regarding expansion, at the end of the week [or] after the exemption. And they are made impure after one week, which is seven days.

Jastrow