I found two dark black marks, both thin lines about less than an inch long on the tile wall in my bathroom (not near the shower). I tried smearing it but it wouldn't budge. However, I was able to scratch if off. Wish I would have thought to take a picture but I didn't. The bathroom is directly near our front door if that makes any difference. I am positive it was not there this morning. Is this consistent with bedbug fecal matter on tile surfaces?
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