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probably be a good idea

https://www.backyardchickens.com/a/common-egg-quality-problems , if you have different breeds you could at least pin it down to the one breed and then just keep an eye on your ducks(I said hen because I thought female ducks were also called hens) then you can determine which one it is from...

Those look like the hen has a repro infection those eggs should be tossed and the hen(s) that laid them need to be checked to see what they have and then either treated or culled. casportpony or eggcessive might help but that is what happened to one of mine. ----the white looking area could be...