Dark circles under the eyes can appear for a variety of reasons, from fatigue to aging or underlying conditions like allergies or eczema. While usually harmless, these dark circles can affect self-confidence.

Here are some possible causes of dark circles under your eyes:
Allergy
Allergies can trigger the release of histamine, which causes blood vessels to dilate and swelling around the eyes.
Contact dermatitis
Skin irritation due to contact with certain substances or allergens can cause an inflammatory reaction, resulting in dark circles.
Hereditary
Genetic factors can lead to thinner skin or increased pigmentation around the eyes.
Pigmentation Abnormalities
Uneven melanin distribution or excessive pigmentation can create dark circles or discoloration under the eyes.
Scratching or rubbing eyes
Constant scratching or rubbing of the delicate eye area can cause skin irritation and inflammation, leading to dark circles.
Exposure to sunlight
Too much exposure to ultraviolet (UV) rays from the sun can cause dark circles under the eyes.
Natural aging process
As skin ages, loss of collagen and fat can cause the skin around the eyes to thin, making dark circles more visible.
Low iron levels, also known as anemia, and vitamin B12 deficiencies can also play a role in causing dark circles under the eyes.