I have a couple of questions about dark circles.

These days, I'm worried because the area under my eyes is getting darker and more dull.
They say that dark circles appear when you're tired, but I don't know the exact cause, whether it's because I'm tired from work.
I want to get rid of dark circles under my eyes because they make me look dull and lifeless.
This is a question about the distinction between temporary phenomena and chronic problems and how to deal with them.

I'm wondering if temporary dark circles, that is, dark circles that appear after lack of sleep or extreme fatigue, will naturally disappear with enough rest.

I would like to know what types of dark circles require hospital treatment and how to treat them.
Are there any self-diagnosis tips to see if this is something that will disappear while watching?
If there is a simple way (like pulling the skin), please let me know.

Is there any case where it can be treated with ointment??