Halakhah for Negaim 4:2

יֵשׁ בְּמִחְיָה מַה שֶּׁאֵין בְּפִשְׂיוֹן, וְיֵשׁ בְּפִשְׂיוֹן מַה שֶּׁאֵין בְּמִחְיָה. שֶׁהַמִּחְיָה מְטַמָּא בַתְּחִלָּה, וּמְטַמָּא בְכָל מַרְאֶה, וְאֵין בָּהּ סִימַן טָהֳרָה. יֵשׁ בְּפִשְׂיוֹן, שֶׁהַפִּשְׂיוֹן מְטַמֵּא בְכָל שֶׁהוּא, וּמְטַמֵּא בְכָל הַנְּגָעִים, חוּץ לַנֶּגַע, מַה שֶּׁאֵין כֵּן בְּמִחְיָה:

There are [laws] by a healthy patch of skin that spreading does not have, and there are [laws] by spreading that a healthy patch of skin does not have. For a healthy patch of skin makes [the <i>Nega</i>] impure initially, and makes impure with any appearance, 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> impure, [as well as if it spread] outside the <i>Nega</i>, which is not true by a healthy patch of skin.

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