Yes, it can help to relieve the dark circles. When you take a leaf of mint on your skin, you can experience its cool, refreshing aroma due to some natural chemicals smoothing and caressing our skin. As we all know, your tiny vessels under skin around your eyes expand due to deficiency of sleep so that our blood circulation is hambered leading to the blood blocked there. That is why we have dark circles and bags out there. Add some water to the mint and blend them thoroughly using a spoon or something like. A few drops of honey also helps. By the way, you must make sure that you get the leaves from a safe source, I mean, they are not polluted by pesticides. Besides, you can use a soft cloth to wrap an ice cube or cool tea bags(put in the freezer for half an hour) to your eyes try to relive the blood circulation.