I've had this canker sore for just a week now along with one on my upper gum on the left side, the developed while I was sick. Herpes or Canker sore?
Located on piece attaching lip to gum
canker sores develop inside the mouth.
So you're leaning towards herpes?
yes
ask your physicuan for Zovirax Ointment
Not herpes, just a canker sore!