Michyeh, מחיה, is an area inside a nega (any of the four nega hues) that has an appearance of non-affected and healthy skin. Although the michyeh can make its appearance on the interior of the bahereth and its sapachath, it more often appears inside a se’eth nega.
The minimal size of the michyeh is כעדשה -the size of a lentil, another measurement given is 2 hairs by 2 hairs. If the michye is this size and it is encompassed by a se’eth or bahereth of at least 2 hairs breadth on all sides, It is an indicator of immediate tumah.
The michye is a powerful type of tumah indicator; if it makes an appearance in the se’eth or bahereth even after the kohen pronounces it tahor (say after 7 days) that is a call for immediate tumah. (Sifra tazria min. Ch. 66)
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