Marks on pics from D5100

Started Jun 3, 2014 | Photos thread
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backtrack Forum Member • Posts: 70
Marks on pics from D5100

These marks have appeared on some recent photos from my D5100 (this is a jpg from an unprocessed RAW file). Any suggestions as to the cause and how best to address? Thank you.

Comment & critique:
Please provide me constructive critique and criticism.
Nikon D5100
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