Hi Can anyone tell me what causes these skin artifacts on renders. They always seem to appear around the upper arm area and are driving me mad. What starts off as a promising render is totally spoilt by these little bumps (circled in red in the picture). I have tried lots of different textures and different settings in the render-options but to no avail.

Does anyone know what causes these and / or how to get rid of them. I want smooth skin on the body like that of the face but just can't seem to achieve it.