As it turned out, these were bedbug eggs.
What I learned:
Bedbug eggs are small, about 1 mm, white, oval, shiny, similar to rice grains. The female bedbug lays them in secluded places: in the seams of a mattress, behind baseboards, in cracks in furniture.
After 6-10 days, larvae hatch from them, which begin to feed on blood. Bedbugs rarely carry infections, but their bites cause itching, allergies, irritation and insomnia.
Where they come from:
They can be accidentally “brought” home in a suitcase after a trip. They get in with used furniture or things.
They can also get over from neighbors through ventilation or cracks in the walls.
📌 How to get rid of them:
Do a deep cleaning, vacuum all cracks, seams and joints. Wash linen and clothes at a temperature of at least 60 °C.
Use a steam cleaner on the mattress and furniture. Contact a professional pest control service – otherwise there is a risk that the bedbugs will return.
Now I understand – if I had not noticed these “grains” today, in a week I would have had a whole army of these parasites in my house.➕
