To me, both are pretty bad, but a canker sore is always worst! Cold sores can hurt sometimes and are a pain to have on the lip, especially because of it being un-comftorable! Canker sores hurt very...
a cold sore is a canker sore on the outside lip a canker sore is anywhere inside your mouth p.s a canker sore can be transmitted to some one else also nobody knows what causes a canker sores but i...