what causes eye swelling and itching?
<answer> Blepharochalasis, Shingles, Allergic reactions. <context> Allergic reactions occur when the surface of your eye is exposed to allergens. The reaction triggers the release of histamines, causing itchy, red, watery eyes. Rubbing your itchy eyes is highly discouraged. As you rub your eyes, you release more and more histamines, which results in worse symptoms. You can also scratch or cause other trauma to the surface of your eye by rubbing the itch. Itchy eyes can be caused by various eye conditions too. Dry eyes are known to cause discomfort and irritation. Blepharitis, a non-contagious eye disorder caused by bacterial or skin conditions, also causes itchy eyes. With blepharitis, the eyelids become dry, scaly, and itchy. Typically the eyelashes fall out.