My eye is swollen for no reason. what is a good home remedy?

From allergies: Cold/ cool compresses will help. A mild steroid will help the swelling.

Allergies : Allergies cause swollen eyelids. Cold compress can relieve the swelling. Over-the-counter allergy medicine, such as loratidine (claritin) ; eyedrops help relieve it. Zaditor (ketotifen) is a good eye drop for itching. If it persists or gets worse go to your doctor. It could also be other problems.