Skin of lower back
Regio lumbalis · Kůže bederní krajiny
Skin & appendages
Looks like
Skin over the lumbar spine between the ribs and the pelvis, with two dimples over the pelvis's back.
What it does
Covers the back's thick muscles and bends with the spine.
Keeping it well
Pain here is almost always in the muscles or spine beneath, not the skin; a band of blisters on one side may be shingles.