Injections of an inert substance called polymethylmethacrylate ( PMMA) enclosed in tiny droplets of natural collagen are given to improve wrinkles. The patient’s body absorbs the collagen while PMMA, which is not absorbed, stimulates new collagen growth. PMMA keeps the implant from degrading as quickly as a collagen-only implant. Repeat injections may be necessary and allergic reactions are possible.
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