okay...............I personaly would question this home testing idea.
its sounds more dodgy than a 'nigella' idea to me.
its more than likely that your child does have a mild allergy.
Based only on facial reaction= a rash, on face ( reddness?, nettle rash? or just eczema?) that responded to piriton.
But, for an imunoligist to tell you that a child has a mild allergy , that has a great chance of outgrowing, they normally still tell you to avoid.
and they base their dignaosis on family history, childs history, blood and skin prick tests.
so, for me, the idea of a GP saying that its a mild allergy, without any previous medical back up, is very questionable.
allergies by there very nature are unpredicitable in reaction severity.
You can develop alleriges any time, even if previously the food was enjoyed safely.
the reaction severity depends on allergic persons health at time of injestion, and the amount ingested.
How is the doctor asking you to proced?
is he asking you rub a little on face first and wait?
then rubbing a little on lip and waiting?
then trying a small amount?
or is he just suggesting you just give your infant cup of milk?
I have to add that any gp who was trained over 10 yrs ago will have had very little to no training in allergy , both classic or intolerance.
A recently trained doc would be a better bet for info.
or one who personaly has under their wing a large amount of allergic children/adults.
If you are really concnered, please ring the anaphylaxis campaign and ask their opinon.