Two weeks prior to your appointment, you must not use medications that are labelled as “causing photosensitivity.” You must also avoid being exposed to direct sunlight, tanning beds, skin care products containing Vitamin A, such as RetinA, waxing, chemical peels, using Glycolic and Salicylic acids, and whitening creams (hydroquinone). The areas that will be treated should be free from moisturizers and make-up the day of your appointment. If you want to undergo HIFU treatment you must not have a history of cold sore or fever before treatment. Cold sores will impair the treatment process. The HIFU treatment cannot be performed if a fever is present. In such cases, the treatment can only be done after recovery from either the cold sore or the fever. You want to make sure that you are free from any of these health issues at least the day before the HIFU treatment.