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In the past few decades, facial fillers have been recognized as ideal for use as injectable therapeutic tools for soft tissue augmentation and rejuvenation. With recognition of its value, filler injection has become one of the most commonly performed cosmetic procedures. Clinically used dermal fillers are composed of silicone particles, autologous fat, bovine collagen, paraffin, and polytetrafluoroethylene [1]. Fillers should have the properties of biocompatibility, safety, and stability at the implant site and the ability to maintain their volume, remain pliable, and induce minimal foreign body reactions, without causing foreign body granuloma [2]. However, fillers are not autologous tissue; instead, they are essentially foreign bodies that can cause an unwanted inflammatory response in individuals. Additionally, fillers are injected in a blind procedure in which the practitioner is unable to note exactly where the material is being directed. Due to these problems, fillers can cause potential complications. In East Asian countries, the illegal injection of various substances by unlicensed practitioners has been extensively carried out on various parts of the body, including the face [3]. This dramatically increases the risk of complications. We herein report a very rare case of filler migration to the eyelid, causing unilateral blepharoptosis and swelling. Da Woon Lee, Eun Soo Park, Wang Seok Lee, Min Sung Tak, Ah Rim Moon

Upper Eyelid Pseudocyst Related to Forehead Filler Migration: A Rare Complication of an Illegal Filler Injection