Hives?

From time to time Alex gets a strange looking red bump or two on his face. It doesn't seem to itch and we don't know what it is. I'm wondering if it's a hive. This one from this morning showed up during breakfast and lasted for about an hour. I'm now starting to keep track of when he has them and what (if anything) he was eating or touching. This morning he was eating scrambled eggs which is a common trigger. He eats eggs fairly often though and this doesn't happen every time. We can't figure out the culprit. Also, he only gets one or two bumps and only 2-3 times a month. We go to the doctor next week so I'll ask her about it then.