What can cause my son to get a rash when he is eating?

My son gets this rash when eating, wondering what it is, goes away within 10 minutes, Is it just the start of heat rash?

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Irritation from the food if he’s messy or mild allergies. Depends on what the rash looks like and where it develops.

I second irritation from food he’s eating. Especially if it has a high acid content, like tomatoes and it’s only where food has touched. If it’s all over the body, it could indicate an allergy to what he’s eating.

Maybe allergic to what he’s eating