“Glabella” is the skin on your forehead, between your eyebrows and above your nose. When you make facial expressions, that skin is moved by the muscles on your forehead.
You may notice wrinkles that look like wavy lines beginning to develop, depending on your face shape, skin tightness, genetics, and how often you make certain expressions, These wrinkles are called glabellar lines, or more commonly, frown lines.
The lines in this region are either dynamic (are caused only when you move the muscles) or static (they are there even if you do not move the muscles). The stronger and more contracted the muscles on this area are, the deeper and more static the lines are and the treatment is more challenging.