Patients with a swollen and red patch under the eye may have blepharitis, eye allergies, conjunctivitis and other causes, patients can be treated under the guidance of the doctor, such as medication, surgical treatment and so on. 1. Blepharitis: Blepharitis patients can experience redness, swelling, burning, pain and other discomfort in the eyelids under the stimulation of inflammation. Patients can follow the doctor’s instructions to use antibiotic treatment, such as levofloxacin eye drops, erythromycin ophthalmic ointment, etc., to control inflammation and promote recovery. If the patient’s eyelid abscess, the patient can incise and drain the abscess to promote the recovery of the condition. 2. Eye allergy: the human body after contact with certain substances appear allergic reaction, patients often have skin itching, followed by erythema, wind mass, bright red or pale white, skin color, a few patients only have edematous erythema. Patients can follow the doctor’s instructions to use loratadine and other anti-allergy drugs to promote recovery. 3. Conjunctivitis: Conjunctivitis patients in the inflammation stimulation, patients can appear red eyes, but also eye swelling, photophobia, eye secretion increase and other symptoms, patients can follow the doctor’s instructions to use tobramycin eye drops and other drugs treatment. It is recommended that patients with obvious redness and swelling of the eyes should consult a doctor in time to assess their condition and follow the doctor’s instructions for treatment.