I have had cold sores, but none now. Do I need to mention it?

Yes, tell the treating professional before a facial procedure, even when there is no visible cold sore. A quiet history is still relevant because procedure choice and prevention planning may change based on that history.

A history of cold sores still matters when there is no active blister

The treating professional needs that history when deciding on suitability and any medical precautions. Do not self-prescribe preventive medication or assume the absence of a blister is complete clearance.