Swelling of the right eyelid for no reason may be due to allergies, blepharitis, etc. 1. Allergy: As the right eyelid comes into contact with allergens, an allergic reaction occurs. At this time, the right eyelid will appear swelling, burning, itching and other phenomena, as long as you leave the allergen, the right eyelid will slowly recover, if the swelling is more serious, you can follow the doctor’s advice to use Olopatadine eye drops, Imitrex Fumarate eye drops and so on. 2. Blepharitis: If the eye is infected and blepharitis occurs, the eyelids will be itchy, red and swollen, and when you touch the eye, you will feel very painful, and you will also feel a small nodule on the eyelid. At this time, patients need to follow the doctor’s instructions to use anti-infection eye drops, such as ofloxacin eye drops. Patients with swollen right eyelids for no reason are advised to go to the hospital in time for consultation and standardized treatment after clarifying the cause of the disease.