From the photo, those look more like insect droppings/frass than ordinary dirt. The most likely possibilities are drywood termite pellets or carpenter-ant frass, especially because you found two concentrated piles in the same room.
Drywood termite droppings often look like many tiny brown, coffee-ground-like pellets and can accumulate in piles beneath a small opening in wooden furniture, walls, window frames, or other wood. Carpenter ants can also push sawdust-like material out of their nests.
A few things to check right away:
- Look above and around each pile for a tiny hole or crack in wood.
- Check the bed frame, wardrobe, skirting/baseboards, window frame, and wooden furniture.
- Look for small insects, wings, or additional piles nearby.
- Don’t simply vacuum everything and forget about it—mark or photograph the location first so you can see whether another pile appears.
- If the material comes from a wooden structure, consider having a local pest-control professional inspect the room, particularly if new piles keep appearing.
I wouldn’t confidently identify it as mouse droppings from this photo. Mouse droppings are usually larger, elongated pellets rather than a large quantity of tiny, fairly uniform particles like these.
If you can send me a close-up photo of just a few of the particles, preferably next to a coin or ruler for scale, I can help you narrow down whether this looks more like termite frass, ant frass, insect droppings, or something else.
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