bag under eye

I'm a 52 year old male, athletic, and adhear to a low fat. low Sugar diet, and have eliminated all animal products, except fish, for almost 20 years. I look fairly young for my age, but have a slight bag and ring under my right eye only, causing people to comment that I look tired. Well, I've looked this way for at least 15 years when I first noticed it.
What can I do?