Wrinkles result from distinct structural changes occurring in specific parts of the dermis and
the subcutaneous tissue. They are part of the skin’s aging process, which combines both
intrinsic and extrinsic components (54–56).
There is little information concerning the possible racial differences as the intra-ethnical
variations according to the age and possibly the site seem to have a much more important
impact on the variability of the measurements. However, among people of same age, it has
been shown that the number of wrinkles is the highest in Caucasians, followed at a same level
by the Hispanic and black people, the smallest number of wrinkles is observed in Asian
subjects (57). A comparative analysis of the number of wrinkles on 10 anatomical sites of
Caucasian and black subjects of same ages shows that actually the difference only concerns the
peri-auricular area (