Hi there
Dark circles under the eyes also go by the name of Periorbital Melanosis or Allergic Shiners'....likely to be an allergic phenomenon and linked to Atopic Dermatitis. Genetics 🧬 does have a role to play in some.
Lack of good quality 😴 sleep and Stressors can and do cause &/or aggravate the condition.
A more detailed history will be required together with a clear pic
Do Consider an Online Consultation with all the above mentioned details and we can discuss and take this further and come up with a treatment plan 🙏
Health Tips
Camouflage with Camlin or other brand of water based cosmetics do help mask the issue and tide you over till a more definitive solution is reached.
Hydration is important as is a good quality 😴 and stress busters like swimming, sex, yoga are recommended.
Since you wear glasses 🤓 perhaps photochromatic ones can be considered so that they give you a "tint" that serves to mask the pigmentation.