Female lower back

Anterior superior iliac spine

Figures 1 and 2:  A characteristic sign of the female back are the "fossulae lumbales" (above black mark). They mark attachments of the skin at the posterior superior iliac spine, and are especially well expressed in the presence of substantial subcutaneous fat tissue. 

Fig 3: Lateral view onto the hip presenting the anterior superior iliac spine mostly referred to as just "iliac spine" (in front of the mark). Sartorius and tensor fascia latae insert close to the iliac spine, the rectus femoris slightly below (fig 4). The iliac spine is likely not to present in this position, if the sartorius and/or the tensor fascia lata are under tension and/or in the presence of substantial subcutaneous fat tissue.