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Retinal cysts as in cystoid macular edema occur in the center, cause blurring and are due to inflammation, usually after surgery. Cysts in the peripheral retina are quite normal and are sometimes called cystic retinal tufts. Occasionally, cystic tufts can be torn by acute vitreous separation causing a retinal tear which may be lasered to prevent detachment. ...
The causes behind sebaceous cyst are: 1  Blockage of oil or sebaceous glands. 2  Excessive testosterone production. 3  Swollen hair follicles. 4  Increased production of sebum on skin. 5  Skin trauma. 6  Exposure to sun. 7  A person, who has a history of acne, can suffer with sebaceous cyst. 8  Waxing and shaving.