You can chew while having a canker sore on your lip. If you spit right where the canker sore is though it will burn so just be careful
A canker sore is an open sore inside the mouth, caused by various reasons including stress. They are not cancerous or contagious, and may or may not be genetic. There are no long term effects of having a canker sore.
No, chancre and canker are not interchangable. A canker sore is a benign and painful sore on the mucous membranes. A chancre is a painless ulcer on the mucous membranes that is a specific sign of syphilis.
Gargle or swish warm water with salt in it 2-3 times a day until the canker sore is gone. Salt is a natural healer and is great for canker sores.
A canker sore can be caused by many things. See the related link for more information on canker sores inside the mouth.
nooo you casn not