A member asked:

There's a sore on my boyfriend's inner upper lip. it's white/yellow with red around it. he gets them when stressed. is it a canker sore or a cold sore?

A doctor has provided 1 answer

Canker sore: Ouch, both are quite painful ! If it is not painful then it may be something else. Cold sores tend to return in the same spot on the border between the lip and skin.

Answered 11/8/2015

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