Simple Steps to Reduce Dark Circles at Home

4. Use Nasal Spray

One common reason for dark circles under the eyes is nasal congestion. This is why your under-eye area looks darker and duller when you're sick. To reduce circles caused by nasal congestion, it's important to treat the congestion instead of just the symptom. Nasal sprays are a quick and effective way of reducing that congestion because they help to clear nasal blockages. However, you should always follow the package directions carefully; nasal sprays can be addictive if used too long.