If you suffer from seasonal allergies, sneezing and a stuffy nose might not be the only side effects you have to suffer through. For some people, nasal congestion can cause blood flow to back up under the eyes, and this causes an allergy shiner. The skin under the eyes is thin and the congested veins in the area can give the appearance of dark circles. Some sufferers may also notice puffiness, because allergies are nature's gift that keep on giving.
To decrease the appearance of the circles, you need get your allergies under control as much as possible. If you know what you're allergic to, avoid it. If that's not a possibility, try allergy medication, which should prevent congestion in your nose and sinuses. If you still notice a dark shadow or swelling under your eyes, I will share my favorite natural remedy when you read more.
Dip a washcloth in cold water, and then ring it out. Hold this cold compress over your closed eyes for about five minutes. You can also use sliced cucumbers instead. Repeat this a few times a day. The cold temperature will help constrict your blood vessels, minimizing darkness, and it will also help minimize tissue swelling.
Also be sure to apply facial sunscreen with an SPF of 15 or 30 under the eyes every day since sun exposure can darken skin even more.