In females low iron ( low Haemoglobin) is a very common cause other causes like vitamins
B12 deficiency
Also sunken eyes gives the appearance of dark circles
If you have genetic predisposition then they might not reduce fully
Also certain allergies , continuous rubbing if eyes can lead to such problem
Next Steps
Consult through video consultation for detailed precription
Health Tips
Eat a balanced diet with green leafy veggies andfruits