A shower arm is the pipe between the wall fitting and the showerhead. Water near the wall opening can come from spray running back along the arm or from a connection that leaks while the shower runs. A stain on the other side of the wall can indicate water is traveling beyond the visible trim.
Note where the water first appears
If you have already observed the leak, record whether it began at the showerhead threads, the wall opening, or a nearby surface. Avoid repeating the test if water is already reaching finished walls or ceilings.
Share a photo without turning the arm
Show the plumber the arm and trim and mention any recent showerhead replacement. The plumber can check the accessible connection and decide whether the fitting inside the wall needs inspection.
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