Well, generally speaking, dark circles are a very common skin problem, which is troubling every second person in today's stressful lifestyle. And for the causes, there will be some ones. For example, people get rarely any time to get proper sleep and they lack of nutritional diet. To treat it, there are many ways you can just have a try. For example, you can just apply potato juice, which has bleaching agents in it. And in common, you can soak cotton balls in the juice and can keep them on your eyes for at least 20 minutes while having rest. It helps in reducing the dark circles. Also, eating healthy nutritional diet and having a good rest is also essential.