Dark circles have a variety of causes like stress, dehydration, lack of sleep, volume loss, hyperpigmentation, pigment deposit, skin laxity or genetic. It is important to find the underlying cause and then proceed with treatment. After analyzing the pictures provided, it seems like you have hyperpigmentation along with volume loss or periorbital fat loss. This is generally caused due to overstraining the eyes while using gadgets/laptops/phones/television. This makes your eyes look sunken and the undereye look hollow. The only treatment for volume loss is fillers or fat grafting. Fillers are a preferable option because it is temporary, dissolvable and has no downtime. A hyaluronic acid-based filler is commonly used in this case. However, the hyperpigmentation can be taken care of with a combination of topical treatment containing vitamin C/ caffeine and mild retinoid derivatives.