Polyalkylimide
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,<ref>Template:Cite journal</ref> gluteal atrophy, acne, and scars.<ref>Template:Cite journal</ref>
In plastic and reconstructive surgery it is used for building facial volume in the cheeks, chin, jaw, and lips. Reports of infections<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> and migration of polyalkylimide in the face<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> 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.