Severe dark marks under eyes, nose is always stuffy and runny. No allergies, non-hereditary, HELP!!?

Could be a deviated septum or some other structural problem, smoking, sinus problems-- Go see an ENT Dr. The dark circles under your eyes can be improved with a women's eye cream. Or try ice in a cold washcloth before going out. The skin under the eyes is very thin. When blood pools under the eyes, it shows up as dark circles. Try not to rub your eyes alot. Also for your sinuses, try nasal irrigation, like a Nettipot.