If the water is coming from behind the wall, that means that the faucet most likely split due to water being left inside the faucet when the temperature got below freezing. If the faucet is split, then it will have to be replaced. To replace the faucet, there will be 2 things you need to know. First thing would be to know the wall thickness. To find the wall thickness you can take the stem out of the faucet and measure it from end to end. Once you have the total length of the stem you will need to subtract 3.25 from that measurement, and that will be the wall thickness. For example if the stem measures 7.25 inches the wall thickness will be 4 inches. The next thing you will need to know is how the faucet attaches to the main plumbing. There are many connection types, so you would need to the connection size, and how it connects so you can get the correct replacement faucet.
See below for help finding the correct stem
See below for help with the different connection types
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