Have suddenly got tiny flies in my house. Don’t have any plants and don’t keep any fruit outside the fridge. Just had some new neighbours move in with a dog at the same time... could it be that? Is it my sink? I did have a small itchy bump on my hand this morning when I woke up. Put out a glass of vinegar with fairy liquid and give or six of them had gathered on the rim but when I went to squish them they all flew off!