Help in identifying pest sign

Bszweda

5 year old buck +
I tried to make my cabin as bomb proof as possible, but I think I have an unwanted pest. Also were I saw the sign a loft is above it. I am not seeing any indicating of wood damage or a hole I am thinking termites or carpenter ants. I am not seeing any giant ants running around. The cabin is sprayed foamed insulation, but under the loft area. Any ideas? I plan on buying carpenter ant traps and putting them in the cabin.

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