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It is recommended than sun protection creams should be used daily for at least two weeks daily prior to your treatment, if not already being used daily.
Professional strength skincare products with ingredients such as retinols, alpha-hydroxy acids (AHAs), tretinoin or any type of vitamin A derivatives should be avoided, and anti-viral medicines may be prescribed if you are known to have a history of cold sores.
Your practitioner may prescribe medicine even if you do not have a history of cold sores if you have other contra-indications which may put you at risk of developing side effects following treatment.