Dark circles under the eyes are often harmless, but they can also have a medical cause, which you should always discuss this with your doctor.
Medical reasons behind dark circles under eyes include:
- Anaemia (Iron Deficiency) - low iron levels in the body resulting in a poor supply of oxygenated blood to the skin, including under the eyes
- Thyroid issues - thyroid disease can create fluid retention, particularly around the eyes, and this puffiness can lead to dark circles under eyes
- Psoriasis or eczema on the face - these conditions inflame and irritate the skin, which can lead to redness or darkening of the skin. They also tend to be itchy, and rubbing the area will further exacerbate dark circles under eyes