Lipsore 5% w/w Cream is used for the treatment of cold sores. The active ingredient is aciclovir, an antiviral agent. Apply at the first signs of a cold sore. It can also be used to speed up healing if one has already appeared. Do not use Lipsore 5% w/w Cream: If you have ever had an allergic reaction to Aciclovir, valaciclovir, propylene glycol or any other ingredients of the preparation (see section 6 for a complete list of ingredients). Inside your mouth (e.g. for mouth ulcers) or nose. For any skin infection other than a cold sore. For use In the eyes or genital area.