The former is often associated with craniofacial hypoplasia, Treacher Collins syndrome, triangular head deformity, navicular head deformity or congenital zygomatic hypertrophy of the zygomatic arch; the latter, in addition to physiological causes such as old age or weight loss, staying up late, malnutrition and other causes of facial and temporal skin thinning and soft tissue reduction, trauma, burns, surgery, hemifacial atrophy and botulinum toxin injections can also lead to temple depression.