Thinker's Lines
The so-called thinker's lines (also known as glabellar lines or frown lines) are vertical folds of skin that form between the eyebrows when they are drawn together in anger or when thinking deeply.
The so-called thinker's lines (also known as glabellar lines or frown lines) are vertical folds of skin that form between the eyebrows when they are drawn together in anger or when thinking deeply.