The cause of your problem is the same as that of the ordinary swollen eyes. Eye allergies are the most common cause of swollen eyes. When your eyes are allergic to something, the immune system overreacts, which leads to eye allergy. You can ask your doctor for prescription medications to relieve the allergy. Eye styes and chalazion can also be the cause. They are the result of inflammation and blockage in any of eye glands. Pink eye may be the cause of swollen eyes. Besides, Cellulitis, Graves Disease and Herpes Infection are also common causes of swollen eyes. The other eye is OK because it is not affected by the factors mentioned above.
It is normal. That means that there is only one eye's infection for you which cause your swollen eye. The coming bacterium may cause it. You need to have the good rest for the eyes. You could use the eyes drops to release the symptom. You could also use the warm compress to make your eyes feel comfortable. In order not to let your another eye get infected, you need to keep the good habit of using your eyes and eat healthy food.
There are several factors causing this problem.First. You may drink a lot of water before sleeping and sleep sideways all the time during the night.In addition.losing sleep and staying up too much also make one of your eyes swell.In the second place.You may have used some unsuitable cosmetics which harm to your soft skin.Though cosmetics can bring women beauty,it's also important to care about the positive side of it.Thirdly.You may develop a mild inflammation in the eyes.If so,you must attach enough importance to your eye problem.My suggestion is to go to see a doctor and take some medicine.In all.Eyes are the most important window of humans, and you should protect them as possible.