Would this be an allergy?

[Miaow]

Can a baby develop an allergy to something after having it for a few months with no problem?

Yesterday EJ was playing with /chewing on daddy's car keys just before she had dinner (we did have some pizza while driving home ) anyway she had her usual golden circle tuna mornay which she has prob a one or twice a week for a few months prior to this.

I noticed her eyes were waterery a little on the 1st mouthful then were fine - but afterwards she had some spots around her mouth - (today they are still there but sorta look like a excema like rash rather than spots and she has had some excma on her chest). She wasnt sick or upset or anything afterwards

Im wondering were the spots a reaction to the tuna for some reason or could it have been something on the keys. Or is it just a little excema on her chin maybe just got inflammed when she got some food on it (she has had a spot there for a week or so).

Hope this makes sense lol

Thanks

[Oscar's mum]

I would say it would be more likely something on the keys rather than the food.

[Miaow]

Thanks Oscar's mum - I was sort of thinking it was probably something on the keys but wasn't real sure...

[jembelina]

My guess would be something from the pizza that was on your/dp's hands or the keys iykwim. The tomatoe paste would be a likely culprit I would say.