Anyone allergic to raspberries or have a baby who is?

I’m 99% sure my 1 yo had an allergic reaction to raspberries but I didn’t think that was a common allergen and no one in my family or my husbands have any food allergies. But the day he got the rash and it was even on the back of his neck the only thing different he ate was raspberries and he ate a lot of them. Everything else he has eaten tons of times but I don’t give him raspberries but he had them at my parents house. I noticed when. I went to go give him a bath he had a rash all over and I don’t think it was heat rash because he spent all day in just a diaper. When he was smaller I gave him like one or two raspberries and didn’t notice a reaction then but he ate a big handful of them this time so maybe that was it?