Messy Face 3 Evenings in a Row

The last 3 days have been interesting. 3 days ago, his face got a bit red during dinner, but there were no hives, so I didn't do anything. Yesterday, his face was slightly red in the afternoon, and his face got more red around dinner, and his lower lip looked slightly swollen. We gave him benadryl and it cleared up. Before dinner his face was slightly red again, and during dinner he had slight itching, redness, and slight swelling around his mouth. We gave benadryl and it resolved. The only thing consistent about the last 3 days is Cranberry Grape juice. But the swelling doesn't happen immediately after drinking. And Doug gave him the juice in the morning, and nothing happened. I hope he is not getting a new allergy! I wonder if it is a contact allergy from touching my hand while we said grace. Very frustrating!!