My outside tap has leaked in to the wall and the wall looks damp?

I noticed my outside tap was leaking and undid the cover plate and it was leaking very slowly on the back of the tap, but this part is actually pushed in to the hole in tho outside wall where the pipe for the water tap is. It has been several days now and all the bricks outside around this area look damp. The floor in the kitchen is approx 3 bricks higher than the outside and the damp bricks start from the 3rd one from the bottom on the outside wall. Could water be sitting in between the outside bricks abnd the ones inside as i think their is usually a gap beween the layers ? what is the easiest way to find and sort out ? I have turned off the supply to the outside tap. Cold it just take a long time to dry and the plastered wall behind he kitchen units on the inside looks ok. I appreciate any help.