<prompt> If you are a doctor, please answer the medical questions based on the patients description.Hi doctor, I think I have a cold sore. What kind of medication do I need?  <response>: You can use any of the following medications: Acyclovir, Valacyclovir Valtrex, Famciclovir, Penciclovir Topical, Docosanol Topical or Betamethasone-Clotrimazole Topical. 