CAUSES OF DARK CIRCLESDark circles under the eyes are caused by: Each component must be addressed.1. Thinning out of the skin. The underlying muscle becomes more visible creating a darker skin color.2. Loss of volume in the tear trough due to fat loss and bony loss.3. Excess fat and puffiness in the lower lids casts dark shadows accentuating the darkness under the eyes.Combination therapy.TREAMENT OF DARK CIRCLES1. Treating thinning of the skin. My preferred approach is injecting a very thin layer of Restylane. Using a micro cannula allows this to be done without any bruising. Because this is a very thin layer, the "tindel effect" is prevented. Skin can further be thickened with laser treatments and topical therapies such as Vitamin C and Retinols. 2. Loss of volume in the tear trough. I find that injecting Restylane, and now even Juvederm Voluma, using a regular needle directly on the bony rim where there is volume loss is performed. It is important to inject on the bone and this is more difficult with the micro cannula. There is little risk of bleeding with these deeper injections so there is no benefit to using the micro cannula.3. Excess volume; this is treated with a lower eye lift, blepharoplasty. I prefer to use a stitch less approach behind the eye lid to remove the fat and tighten the skin with a Fraxel Repair (CO2) laser. In summary, one has to address each individual cause. In your case its more the thin out of the skin than volume loss or volume excess so I would use the micro cannula.Good luck,Ran Y. Rubinstein, MD 200 Stony Brook Court, Newburgh, New York Board Certified Facial Plastic Surgeon Clinical Professor New York Presbyterian Hospital National Education Faculty (physician trainer) for: Allergan (Juvederm, Voluma), Valient (Scultpra, Restylane), Cynosure (Cellulaze, Precision Laser Lift) & Solta (Fraxel, Thermage)