Blotchy face after eating?

[DamsonPie]

DS has developed red blotches on his face on three occasions after eating. The meals were blueberry, banana, and chicken with squash. He’s had the same meals at other times with no reaction. I’ve used the same wipes on his face frequently with no reaction. Puzzled as to why this keeps happening? The blotches go away within half an hour or so.

Strong fruit did this to both mine. Strawberries, rasberies, blueberries. I assumed it was the acidity in the fruit irritating their skin a bit. They get a lot on their face at that age!

Anything even slightly acidic did this to my first!