Like any cosmetic treatment, Dysport can have some potential side effects, although they are generally mild and temporary. Common side effects include slight redness, swelling, or bruising at the injection site, which typically resolves within a few hours to a few days. In rare cases, patients may experience headaches, temporary muscle weakness, or drooping eyelids. These side effects are uncommon and can be minimized by choosing an experienced injector, like the team at Ecosse Plastic Surgery.