A Cohen with a מוּם עוֹבֵר (temporary blemish) is a passing problem, and a מוּם קָּבוּעַ is permanent, Rachmana Litzlan. Both are not good and Passel (spoil) the Avoda; except that a person with a מוּם עוֹבֵר can be a full-fledged Cohen as soon as his blemish disappears. Every human being has מוּמִים (issues), in Ruchaniyus or Gashmiyus. If you are smart, you can change a מוּם קָּבוּעַ (permanent issue) into a מוּם עוֹבֵר (passing issue).

You Can Change a Mum Kavuah Hopeless Pickle Into a Mum Over Temporary Issue