Polyalkylimide
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Polyalkylimide is a polymer whose structure contains no free monomers. It is used in permanent dermal fillers to treat soft tissue deficits such as facial lipoatrophy,[1] gluteal atrophy, acne, and scars.[2]
In plastic and reconstructive surgery it is used for building facial volume in the cheeks, chin, jaw, and lips. Reports of infections[3] and migration of polyalkylimide in the face[4] has led Canada to remove it from the market, and the manufacturer of Biolcamid ceasing production. A class action lawsuit was filed against the company.