Plumbing Puzzle

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I have an outside spigot/faucet problem. When water is turned on, it flows
out of my wall (outside) from behind the spigot itself. Water also flows from
spigot simultaneously. When spigot is turned off it does not appear to leak
outside or inside my house. It is copper tubed and my concern is tearing into
my house to fix it. The spigot was used like 2 times after my house was built before this started. Any ideas troubleshooters? Also, anyone in Teller county know a good plumber?