Do Restylane Injections Cause Cold Sores?

Cold sores are associated with many different potential causes. Trauma to tissue, such as that asssociated with an injection of a filler material, can be associated with the development of cold sores.
If you have a history of cold sores, be sure to tell your doctor before having any procedure performed so an anti-viral medication may be prescribed.

Cold sores are caused by activation of dormant viruses living in nerve cells. Stress, UV light, and any form of trauma or stimulation can activate them. Restylane injections, laser peels, any procedures around the mouth can trigger them.
If you know you are prone to them, ask for a prescription for antiviral medication and you should be ok.

Anytime you have an injection procedure there will be some trauma to the area being injected. The reason your physician asked the question was because it's a possibility that after you have your lips injected, you may get a cold sore. There are ways to avoid the possibility of this happening (with a preventative prescription) and he/she may have been trying to determine whether or not to offer you a prescription as a way to prevent a possible cold sore after treatment.