Not all wrinkles are the same. They are often defined according to their location or to how they were formed.
Some wrinkles, normally on the face, are caused by the repeated contraction of certain muscles when you frown, crease your forehead or blink your eyes. With age, these wrinkles become
deeper and deeper.
Other wrinkles are not caused by the contraction of muscles. These normally appear around your mouth or on your neck and shoulders. Although these wrinkles deepen as you age, they are
normally due to sun exposure or to poor skin care.