The answer to 'retaining wall bare spots' is that common causes include poor drainage, soil erosion, or damage to the wall. Symptoms include exposed soil, cracked or crumbling concrete, and uneven surfaces. Solutions may involve fixing drainage issues, repairing or reinforcing the wall, and re-sodding or replanting the bare areas.
For minor issues, homeowners may be able to DIY repairs like patching cracks, improving drainage, and replanting. However, for more significant structural problems or safety concerns, it's best to call in a professional landscaper or retaining wall specialist to assess the situation and provide the proper fix.