Quoting%20commentary for Niddah 8:4

עֵד שֶׁהוּא נָתוּן תַּחַת הַכַּר וְנִמְצָא עָלָיו דָּם, עָגֹל, טָהוֹר. מָשׁוּךְ, טָמֵא, דִּבְרֵי רַבִּי אֶלְעָזָר בַּר רַבִּי צָדוֹק:

If a checking-cloth [literally: witness] was placed under a pillow [after a woman used it to examine herself] and blood was found on it, if it is round it is pure [for it is assumed to be the blood of a louse which was killed under the pillow]. If it is elongated, it is impure, according to Rabbi Elazar bar Tzadok.

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