Cancer cells divide more quickly than healthy cells, and chemotherapy drugs effectively target those cells. Unfortunately, fast-growing cells that are healthy can be damaged too. There are many different chemotherapy drugs with the potential for many different side effects.
Symptoms & Signs. Dark circles under the eyes are a common complaint of both men and women, although they can occasionally be seen in children. As people age, the skin becomes thinner and collagen is lost, sometimes enhancing the appearance of blood vessels beneath the eyes and making the area appear darker.
2. Environmental Environmental allergies are one of the main causes of dark circles around the eyes. The allergies cause congestion that increases the blood flow to the nose. As the skin under the eyes is delicate, it creates a purple tint. It also enlarges the blood vessels around your eyes and creates a dark tint.