Periorbital dark circles 

Periorbital dark circles (also dark circles or raccoon attack) are dark blemishes around the eyes.


Causes:
There are many causes of this symptom, including heredity and bruising.

Heredity
In most cases, the dark circles under the eyes are blood vessels that can be seen through the skin. The skin around the eyelids (periorbital skin) is the thinnest skin in the body (around 0.5 mm thick compared with 2 mm in other areas). Like varicose veins, dark circles under the eyes are usually an inherited trait[citation needed]. When blood passes through the large veins close to the surface of the skin, it can produce a bluish tint. The more transparent the skin—also an inherited trait—the darker the circles appear. In people with a deep-set bone structure, shadowing can also contribute to the dark color under the eyes.


Allergies, asthma, and eczema
Any condition that causes the eyes to itch can contribute to darker circles due to rubbing or scratching the skin around them. Hay fever sufferers in particular will notice under-eye "smudges" during the height of the allergy season. Some food allergies can also cause the area under the eyes to appear darker.


Medications
Any medications that cause blood vessels to dilate can cause circles under the eyes to darken. Because the skin under the eyes is very delicate, any increased blood flow shows through the skin.


Anemia
The lack of nutrients in the diet, or the lack of a balanced diet, can contribute to the discoloration of the area under the eyes. It is believed that a lack of mineral iron can cause dark circles as well. Iron deficiency is the most common type of anemia and this condition is a sign that not enough oxygen is getting to the body tissues.[citation needed]
The skin can also become more pale during pregnancy and menstruation (due to lack of iron), allowing the underlying veins under the eyes to become more visible.


Fatigue
A lack of sleep or excessive tiredness can cause paleness of the skin, allowing the blood underneath the skin to become more visible and appear bluer or darker.[citation needed]
[edit]Liver problems
Dark circles under eyes can be symptom of liver disease.


Age
Dark circles are likely to become more noticeable and permanent with age. This is because as people get older, their skin loses collagen, becoming thinner and more translucent. Circles may also gradually begin to appear darker in one eye than the other as a result of some habitual facial expressions, such as an uneven smile.[citation needed]


Periorbital hyperpigmentation
Main article: Periorbital hyperpigmentation
Periorbital hyperpigmentation is the official name for when there is more melanin produced around the eyes than is usual, giving them a darker color.
Homeopathic Treatment
1. Cina: This medicine not only helps in the treatment of dark circles but it is also helpful in treating dilated pupils, weak sight from masturbation, eyestrain, yellow vision, pulsation of cilliary muscles, abdominal irritation etc.
2. Chinin S: This medicine is used for the treatment of eye infections. It is an effective treatment for intermittent neuralgic pains in and around the eyes.
3. Cyclamen: One of the best treatments for these blemishes is cyclamen. It helps in the treatment of spots before the eyes, black spots around the eyes etc.