Facial sun allergy

My 6 year old granddaughter was tested for allergies when she was 2 years old and was told that she was allergic to something in suntan lotion. She can therefore not use any lotion on her face, even if it is hypo-allregenic. However even when she does not put it on her face there is always a time when it could be in the swimming pool or on her hands etc. It causes her face to go blotchy, not a rash, and then start to swell. It can be so bad that she has ended up in A & E having steroid tablets. This is after us giving her anti-histamines. It happened again yesterday and the doctor said thqt he did not believe in giving her steriods?? but gave her a different anti-histamine. We told him we were going to Spain in the summer and he said simply let her wear a hat, which she does all the time anyway. Has anyone else come across this and what was recommended. Any advice would be thankfully received.
Thanks Jan

[Caryopteris]

Get a copy of the records.  You need to know exactly what she reacted to.  Why would she still be having the reaction after you stopped sunscreen anyway?