口腔溃疡和嘴巴起泡怎么用英语说地道？sore的一个用法

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口腔溃疡：canker sore
嘴巴起泡：cold sore

I have a canker sore.
我有口腔溃疡。
I feel a cold sore coming on.
我感觉嘴巴要起泡了。

canker
can·ker  / ˈkæŋkə(r) /
noun
1. [U]  a disease that destroys the wood of plants and trees
   (植物和树木的)溃疡病,枝枯病
2. [U]  a disease that causes sore areas in the ears of animals, especially dogs and cats
   (尤指猫狗耳部的)溃疡,痈,疮
3. [C] (literary) an evil or dangerous influence that spreads and affects people's behaviour
   (蔓延并影响人的行为的)邪恶,祸害,祸患,腐败
the canker of violence in modern society
  现代社会的毒素 — 暴力行为

cold sore
'cold sore (NAmE also 'fever blister)
noun
   a small painful spot on the lips or inside the mouth that is caused by a virus
   唇疱疹；嘴边疱疹