You are suffering from dryness (computer Vision syndrome )due to overuse of smartphone ,computer& watching TV for long time without blinking, you should first consult ophthmologist for refraction &if any refractive error ,you should use antiglare eyeglasses & if no retractive error ,use zero power antiglare glass. You should also use lubricating eye drops (Refresh liquigel) 4-5 times regularly &,try to have normal blinking while working on smartphone &computer.
Next Steps
Comparative dark skin below or around eyes is because of thinner &soft skin which is more sensitive to sunlight causing darkness ,it is more visible in fair skinned people ,it is not abnormal ,you may apply Fixderma under eye cream once on skin around eyes at bed time ,with regards