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.
Dark under-eye circles can be genetic as well as a result of lifestyle and environmental factors. 1  Bluish circles under your eyes can be due to oxygenated blood under the skin. 2  Brown under-eye circles may be caused by hyperpigmentation.  Sunscreen could be the key to banishing a panda-like visage.