We present new experimental results concerning the phenomena that take place in the contact area between a moving piano-convex glass lens and the smooth, flat surface of a soft elastomer sample. It is shown that a small ridge exists on the surface of the detachment fold or Schallamach wave. The space-time evolution diagram, composed by superimposition of contact area cross-sections, recorded one after the other, shows that there is a correlation between the appearance of these ridges and microdynamic shifting of forward and backward detachment fold edges. Simple rolling of a rubber band, compressed between two rigid plates, enables us to reproduce the ridges on a macroscale.