I recently had Prevelle Silk injected in my lips. I used a topical, retrocaine, leaving on only for 5 minutes prior to injection. There was non to minimal pain, swelling or bruising.
The results look great and are very natural... lets see if it last the full 3-6 months. I previously had Juvederm in the lips. It lasted about 9 months but was VERY PAINFUL (performed at a different facility)!