If you suffer from Cold Sores, also known as Herpes Simplex Virus (HSV), please inform us. Cold Sores present as a small blister, which normally form on the lip or skin under the mouth, nose, and chin. Stress, weather, chemicals, or injury to the lip may all trigger the virus to react. Cold Sores are common, and a history of Cold Sores does not prevent you from having Lip Filler. We recommend no treatment whilst you have an active lesion, on the day of the treatment to take anti-viral medications, unless you have been taking the Vitamin, Lysine as a preventative, you will not need to take both.