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Hi

Sometimes our mouth develops minor cuts inside in, especially on the inner lips. These cuts make eating difficult, but generally don't take very long to heal. In my language we call it "the heat of the stomach" that causes these cuts. The patient is generally advised to take cool stuff like yoghurt and avoid hot stuff like eggs and cheese. My questions are:

What is the name for these cuts in English, both formal and informal? Is this sentence OK?

I can't eat such spicy food. I have got cuts in my mouth.

Is the yellow part natural?

It is the heat of the stomach that causes these cuts.

Again, is the yellow part OK?

If you have got cuts in the mouth, you should avoid hot stuff like eggs and chicken and take cool stuff like yoghurt.

Thanks a lot,

Tom
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Are you perhaps thinking of cold sores or canker sores?
Comments  
Mr. TomWhat is the name for these cuts in English, both formal and informal?

I wouldn't really call them "cuts", but is it possible you are thinking of ulcers (specifically mouth ulcers)? Here is a picture of one:

Mr. Tom
I can't eat such spicy food. I have got cuts in my mouth.

Is the yellow part natural?

Not really. If you have a mouth ulcer you could say: "I've got a mouth ulcer / mouth ulcers". If it's obvious what you're talking about then you could just say "I've got an ulcer", but there are other types of ulcer too (stomach ulcers, for instance), so this could be ambiguous.

If you have an actual cut in your mouth you could say "I've cut my lip/tongue/mouth".
Mr. Tom
It is the heat of the stomach that causes these cuts.

Again, is the yellow part OK?

Not really. It sounds like something from a book written before there was any scientific understanding of biology.
Mr. Tomyou should avoid hot stuff like eggs and chicken and take cool stuff like yoghurt.
"hot stuff" and "cool stuff" are OK in casual English; otherwise, you should say "hot food" and "cold food". I'm not clear whether "hot" is meant to refer to spiciness or temperature, and I don't really understand your examples because eggs and chicken can both be eaten cold and neither is necessarily spicy.
 khoff's reply was promoted to an answer.