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.
Following are some allergic causes of dark circles around the eyes: 1. Seasonal: Seasonal allergies such as food allergies, hay fever, cosmetic allergies and allergens from the workplace or home, cause dark circles. Allergies results in inflammation that expands the tiny blood vessels under eyes.