Great question! There are a few issues which could be going on with your under eye dark circles. Obviously, it would be helpful to see photos or, ideally, see you in person to fully assess what is happening.
-First, some patients genetically are predisposed to having dark circles under the eyes. this can be due to the position of the eyeball in relation to the orbital rim, the bone which sits below the eye. Patients with "negative vector" eyes are predisposed to this issue.
-Second, patients who have a large hump on the nose, often notice shadowing under the eyes in certain lighting. This issue, as well as your septal deviation could be corrected with a septoplasty and rhinoplasty.
-Third, you may have a component of nasal allergies, which can result in "allergic shiners", resulting from congestion of the tiny blood vessels below the eyes.
-And fourth, you may have lower eyelid fat which starts to "pooch" forward from around the eye. This creates bags under the eyes. The combination of this lower eyelid fat pseudoherniation and the cheeks starting to sag can create shadowing under the eyes, what we call the tear troughs.
Depending on which of these conditions apply to your eyes and cheeks, you may be a candidate for fillers, such as Restylane, or lower eyelid blepharoplasty, which I perform without any external incisions, repositioning that lower eyelid fat downward into the tear troughs. This smoothes the transition between your lower eyelids and cheeks.
Best regards,
Dr. Mehta