What are the side effects of having had hyaluronic acid injections?

Possible side effects of hyaluronic acid injections mainly include: 1. Local reactions: Common post-injection local reactions such as redness, swelling, pain, and itching are usually temporary and generally resolve spontaneously within 24 hours. 2. Vascular occlusion: Accidental injection of hyaluronic acid into a blood vessel may cause blockage, leading to serious complications such as blindness or stroke. 3. Allergic reactions: Some individuals may develop allergic reactions to hyaluronic acid, manifesting as rashes, difficulty breathing, etc. 4. Over-injection: Excessive injection may result in skin irregularities, affecting aesthetic appearance. To ensure safety, injections should be performed at正规 medical institutions, and patients should follow their doctor's recommendations.