Immediate side effects like any surgery could be an infection or haematoma. Normally we use fillers for lip augmentation which are foreign substances. The body can react to it and we call it as sensitivity. Sensitivity may develop which may necessitate the removal of the fillers. Nowadays what drugs are used as fillers are natural substances which are present in our body. These may not have many side effects. The only thing is you need to undergo it repeatedly like once in 6 months you need to go for a lip augmentation. If you are going to use substances like fat it is quite unpredictable that how long it may last. It may last a life time or it may form into small bumps.
