Injured Starling fledgling

We have a starling nest where one baby has learned to mostly fly but the other has stayed huddled up in the corner of the grill where its nest is located.

The other fledgling is doing very well and we got concerned about the huddled fledgling. We noticed it has a small wound on the outer edge of its right wing. Mom is still around but does not seem to be feeding as often- is there anything we can do to help the injured fledgling?