Single handle Moen (shower only) has slow leak from pipe out of wall | Terry Love Plumbing Advice & Remodel DIY & Professional Forum

I am using very technical terms here but have pictures to better explain it. Our Moen shower fixture is leaking. I took off the shower head to see if it leaks directly from the wall and it does:



Its a slow but very steady drip and over the past couple of weeks has been increasing in speed. I no longer thing it's just water left over from a shower as it will still be dripping hours later.

This is what the handle part looks...

Single handle Moen (shower only) has slow leak from pipe out of wall