The cause of edema of the right upper eyelid, which is not painful or itchy, may be the presence of a blepharocyst, an early stage of mydriasis, or a systemic disease, among other conditions. Due to the laxity of the connective tissue of the eyelid itself, when encountered with local or systemic endocrine inflammation infection foreign body and other conditions are prone to swelling. 1. Blepharoplast cysts: For unilateral edema of the right upper eyelid without pain or itching, the first thing to consider is whether there is a blepharoplast cyst, which is caused by the blockage of the blepharoplast opening or the accumulation of excessive secretion, and generally there is no inflammation or infection, and it only manifests itself as a limited swelling. 2. Early meibomian gland: when the symptoms of inflammation and infection are not so obvious, it can also be manifested as a simple swelling of the right upper eyelid, due to the lack of fixed stability of the lacrimal gland due to a variety of reasons, it is also manifested in the lower part of the eyelid, which is out of the eyelid. 3. Systemic diseases: renal failure or thyroid-related ophthalmopathy, etc., will have the manifestation of simple eyelid edema. It is recommended that if unilateral simple eyelid swelling occurs and does not dissipate for a long time, or if inflammation occurs, it is necessary to consult a doctor in time to improve the slit lamp microscope and other auxiliary examinations, and then treat the cause of the disease.