When the under-eye looks dark, sleep is the first thing that comes to mind. Lack of sleep can darken the colour, but not every darkness has the same cause. Some comes from pigment in the skin, some from the vessels underneath, and some from the shadow of a hollow.
Suggesting one treatment before that distinction is misleading. Light filler is discussed when a hollow is casting a shadow. If pigment or vessels are in front, another path is needed.
There are three different pictures in the mirror
If there is a hollow, light falls downward and the under-eye looks shadowed. If the colour tends to brown, pigment is considered. A blue-purple tone can show the vessel under thin skin. All three can be present together.
At examination the direction of the light is changed so shadow and colour are separated. Darkness in a photograph can look different from the room.
Filler is not the answer to every darkness
Adding filler when there is no hollow can puff the under-eye. Light filler is therefore planned for a person with a lack of volume, and at a suitable depth.
Allergy, dry eyes, a habit of rubbing, and conditions such as thyroid disease also affect the colour. They are asked about before treatment.
The result does not change overnight
Swelling afterwards can make the area look fuller than it will be. It is judged after the swelling has gone.
Sun, rubbing and sleep affect the colour whether or not there is a treatment. Care at home should stay within what was said at examination.
This article is general information. A personal plan is decided after examination.