Halakhah for Negaim 4:1

יֵשׁ בְּשֵׂעָר לָבָן מַה שֶּׁאֵין בְּפִשְׂיוֹן, וְיֵשׁ בְּפִשְׂיוֹן מַה שֶּׁאֵין בְּשֵׂעָר לָבָן. שֶׁשֵּׂעָר לָבָן מְטַמֵּא בַתְּחִלָּה, וּמְטַמֵּא בְכָל מַרְאֵה לֹבֶן, וְאֵין בּוֹ סִימַן טָהֳרָה. יֵשׁ בְּפִשְׂיוֹן, שֶׁהַפִּשְׂיוֹן מְטַמֵּא בְכָל שֶׁהוּא, וּמְטַמֵּא בְכָל הַנְּגָעִים, חוּץ לַנֶּגַע, מַה שֶּׁאֵין כֵּן בְּשֵׂעָר לָבָן:

There are [laws] that apply to white hair that do not apply to spreading, and there are [laws] that apply to spreading that do not apply to white hairs. For white hair makes [the diseased patch] impure initially and makes it impure with any appearance of whiteness and has in it no [corresponding] sign of purity. There are [also unique laws] by spreading, for spreading makes it impure with any amount, and makes any <i>Nega</i> [diseased patch on skin, clothes, or houses that creates impurity] impure, [as well as if it spread] outside the <i>Nega</i>, which is not true by white hair.

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