Why Do Only Some People Have These Back Dimples?

Back dimples form where the skin is tethered to underlying structures by a short ligament. They are located directly over the sacroiliac joints—the area where the pelvis connects with the spine. Unlike muscle tone or fat distribution, these indentations are not something you can simply “work out” to achieve. Instead, they are a result of body structure and how your skin attaches to deeper tissues. In other words, whether or not you have them is mostly decided before you are even born.

enetics and Inheritance