Dark circles are a huge problem in people of dark skin and can be a result of a number of factors.
1. Deep set eye-sockets making shadows appear under the eyes
2. Dehydration
3. Lack of sleep
4. Itchy/ inflammatory skin diseases like eczema may also be responsible for darker skin.
The skin around the eyes is very thin and thereby is quite sensitive to the effects of cosmetics and sunlight. Dead skin accumulates easily and appears dark. Microdermabrasion and mild chemical peels can help remove this dark layer.
Dr. Sasi Attili