Why does the colour under the eyes change?
As under-eye skin thins and becomes translucent, the vessels beneath show as blue-purple rings. Increased pigment, slowed circulation, eczema and some illnesses can also darken the area.
Why does under-eye colour change?
The dermis of the skin is about 0.3–0.4 mm thick. Under the eyes, internal and external factors can thin it over time to 0.1–0.2 mm. The thinner skin turns translucent, the vessels beneath become visible and a blue-purple ring appears.
Why do dark circles form under the eyes?
- Pigment: inherited or structural increase in pigment in the lid skin.
- Circulation: lack of sleep, an irregular lifestyle, alcohol and smoking can slow venous flow around the eyes.
- Skin conditions: atopic and some other forms of eczema.
- General health: iron-deficiency anaemia and some liver and kidney conditions.
So if the darkness persists, an underlying cause should be looked for too.
More detail: Under-eye bags · Lower eyelid surgery
Frequently asked questions
Are under-eye rings and dark circles the same thing?
Yes, both terms describe the same darkened look.
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References
This page is for general information only and does not replace a medical consultation. Anatomy and treatment plans differ from patient to patient.