Dark circles under the eyes - potential causes and natural treatment suggestions?

Hello,

Been having dark circles around the eyes that are there everyday for past years…it is not full black circle, more of around closer to a nose area on both sides..

Things that you might want to know:

30 male,

Sleep 7-8 hours a day

Don’t have mental health problems or experience psychological pressure/stress

Sleep in complete darkness

Can fall asleep in seconds

Don’t smoke, drink alcohol very very rarely, don’t do any drugs

Am:

Vegetarian,

Night owl - go to bed around 1-2am

What could be causes and what natural remedies shall I seek? Please kindly don’t recommend creams, call me ignorant but I see them as a solution to the consequence of the problem and not the problem itself

Thank you,