On our window sill we have a collection of tiny 1-2mm round insects that look black, but on closer inspection they have yellow spots or stripes. We also had one bigger one (5mm) that was mostly beige/light yellow with black spots.
They look like tiny black ladybirds/bugs - we haven't seen them fly or jump, but they definitely crawl. Until they move, they just look like black dots of dirt or fluff.
We haven't had any bites from them (no itching either) and they don't move from the window sill - to get rid, we hoover them up, and a few days later more appear in the same spot (10-20 of them at once).
Wondered if anyone could ID them, then we might know how to get rid.