What is a escutcheon plate? An escutcheon plate is used to cover the gap between the faucet and the base of the gap where the supply line comes from the wall.
If you have a loose escutcheon plate, water could be getting between the plumbing and the wall causing damage. To prevent this, you should make sure all these plates are secured to the wall with caulk or silicone. This is a quick and easy fix! Slide the escutcheon plate so it is touching the wall or counter and hold it secure while you place the bead of caulk around the plate.
Only caulk from the 7 o’clock position to the 5 o’clock position, so if water does get behind the plate it can run out the bottom of it.