Usually the problem derives from a worn out washer, o-ring, or valve seat that sits inside the faucet. Unfortunately, there are about 300,000 of these in existence. So, to figure out the right one, you’ll need to take the handles apart from the top. Make sure you turn off the water before disassembling the valves. You’ll need to take the whole stem out so that you can see what type of valve seats, washers, or o-rings you need to get. Make a quick trip to your local hardware store to get the proper components, put it back together again, and Voila! No more drips!