Apply the oil before bed and wash your face in the morning with cold water. You will notice an instant reduction in puffiness, but you will need regular treatments to fade your dark circles. Chamomile oil has multiple ways to help your dark circles.  Stress is a well-known cause of dark circles so proper sleep is necessary. Use Chamomile Under Eye.Serum as a direct application under the eyes because it contains anti-inflammatory agents that help decrease the puffiness.