What are these spots on my duck's bill?

Donnigan

Chirping
Apr 30, 2016
261
21
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I saw these spots on my Pekin duck's bill this morning and thought it was mud but it wouldn't scrap off! It looks like mold! What is it?
( I'll try to get better pictures later when i have some help, i had to hold her between my knees lol).
 

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