I have not yet, no, but other acidic foods do not bother him at all; he's never had an issue with anything other than tomato products. He's actually rather fond of spicy food and ingredients like chili powder, mustard, etc., and likes lemon juice a lot, weirdly; I thought of the sensitive skin first and assumed it was fine, and that's why we kept feeding him tomato sauce after the first couple of times he got a rash. I made a post on the other allergens part of the forum explaining a bit more. We're going to talk to his doctor about it next month, but given how my own allergies worsened quickly with exposure as a child I worried enough I wanted to seek out advice from other adults with allergies, esp. non-nut allergies, in advance of that appointment.