I received a tiny BTC deposit in my wallet recently. I don't know where it came from and I hadn't sent or received to or from my wallet in about 2 weeks before the deposit. Could this be something to be concerned about?
It is the Bitcoin equivalent of "spam" so no real need to worry about it (if you are concerned about it being used to *track* some future tx you make then you might want to do some research about "coin control").