Onion juice is excellent for getting rid of dark spots and pigmentation. The rich variety of phytonutrients and antioxidants in onion nourish your skin while removing the skin impurities. You can prepare a face pack by mixing equal quantities of onion juice and fresh yogurt. You can also add a few drops of any essential oil for a pleasant aroma. Massage your face with this mixture, using gentle circular movements for 10 to 15 minutes. This should be done daily for best results.