Side effects and complications sometimes occur but are rare. Because Hyaluronic acid is a natural component of the skin, they are less likely to cause allergic reactions. There are however some, injection related reactions that can occur including redness, swelling, itching, bruising and pain at the injection site. There is a small risk for infection, but this is rare and usually prevented by using a medical grade skin disinfectant cleanser prior to the treatment. Cold sores can be triggered in some people who are pre disposed to the virus, but can be prevented by medication. Blindness is an extremely rare complication that is caused by filler being injected into an artery and travelling to the back of the eye. A single case was reported in NZ and about a 100 cases worldwide out of millions of treatments performed . The risk is estimated to be about 1 in 20 000, this is similar to the risk of blindness with upper eyelid surgery. At Fab Clinic I take this very serious and are constantly attending lectures and safe injection courses, education myself on the best and safest techniques to not only minimize the risk but also on how to treat such an emergency, should it happen. All risks involved will be discussed in detail at the time of you consultation.