Any product injected to fill wrinkles can behave like a foreign body and cause unsightly granulomatous reactions. The subject is constantly evolving, subject to the vagaries of the market. Hyaluronic acid is the most injected product because it is resorbable and probably the least "toxic". In the event of sarcoidosis or an immune disorder, and in the event of vaccination against Covid, granulomas can develop even after very old injections.
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