Swelling is completely normal after lip filler treatment — especially within the first 24 to 48 hours. But knowing what's normal (and what’s not) can give you peace of mind and help you heal faster and more comfortably. Let’s walk through exactly what you can expect in those crucial early days. What Causes Swelling After Lip Fillers? Swelling happens because your lips have just experienced tiny injections, and your body responds by increasing blood flow to the area. It’s a na