 [ Symptoms ] our water is from a well and has no added fluoride is using fluoride toothpaste enough [ Disease ] dark circles are often due to the presence of a vascular plexus located just under the eyes the skin there is very translucent so it can result in the appearance of a bluish tint under the eyes most patients respond to topical retinoids vitamin a derivative cream which can help thicken the stratum corneum and minimize the translucency of the skin under your eyes because the skin there is so thin it is wise to start treatment with a gentle retinoid such as an over the counter retinol first