We are finding strange stuff around the frame of our bathroom door. It looks almost like ground coffee, and has no discernible smell. It's getting out of hand: we cleaned it up yesterday and this much has showed up again today:
There is nothing above or around the frame where this could have come from: no holes or cracks.
Is this the work of some form of woodworm, termite, or some other animal?
We live in a hot, arid climate on the Canary Islands.