What 'blurred' means
Rather than colour that stops at a line, a blurred lip gets lighter and sparser toward the edge until it disappears into the surrounding skin, sometimes a millimetre or two past the natural border. There is nothing for the eye — or a future fade — to catch on.
How it is done
After the main shading, the artist switches to a very light hand and a fine grouping and 'feathers' outward from inside the lip across the border, dropping density as they go. Some methods also lightly stipple a soft halo just outside the border to fake the lost 'white roll' contrast. Colour choice is bright and translucent so even the denser centre looks sheer.
Who it suits
People who want the least 'done' look, younger clients, and anyone nervous about permanence. It is also the most forgiving style as it ages. Clients who specifically want a crisp, defined lip line are better served by a (still soft) more structured blush, not a blur.
