Swollen upper corner of the eye and hard corner of the eye, may be related to mosquito bites, may also be due to blepharitis, blepharospasm cysts and other causes caused. 1. Mosquito bites: If the patient’s skin in the upper corner of the eye is bitten by mosquitoes, resulting in the retention of toxins in the body of mosquitoes, it may cause the upper corner of the eye to be swollen and hard, and the patient may also be accompanied by itching, pain and other uncomfortable symptoms. 2. blepharitis: the disease is usually due to contact lens contamination, often use dirty hands to rub the eyes, resulting in eyelid glands are infected by pathogenic bacteria, which can lead to localized blood congestion, pain in the lump, which may cause patients with the upper corner of the eye swollen, hard performance. 3. Blepharophalangeal cysts: usually due to excessive secretion of the blepharophalangeal glands, resulting in excessive accumulation of secretions in the local tissues of the eyelids, inducing aseptic inflammation, and thus the formation of chronic granulomas, which may result in the patient’s upper eyelid eye swelling, hard and uncomfortable symptoms. It is recommended that patients with swollen, hardened eyelids seek prompt medical attention to assess their condition and treat them as directed by their physician.