Ds1 (almost 7) has suffered from moderate urticaria (raised white spots on reddened skin, extremely itchy - like nettle rash) for a couple of years. He mostly gets it in the summer, in hot weather, and had it quite badly this summer after he'd been rolling about in grass. I give him Piriton throughout the summer (and apply Calamine liberally) and it's never been bad enough to warrant him seeing the GP.
Since Hallowe'en, he's been suffering from sporadic outbreaks, and I've been dosing him regularly with Piriton. Then, on Wednesday, he had the horrible sickness bug that seems to be going around, and on Thursday his thigh came up in an enormous raised weal from his hip to his knee, with patches of more normal looking urticaria round the periphery. I dosed him up with Piriton and by next morning it had gone. Friday afternoon it was back with a vengeance - I rang for an emergency appointment at 3, we went at 5 by which time he was covered with raised, very itchy, weals - on his face, arms, back and legs.
The GP said it could be a more extreme version of urticaria, brought on by the sickness virus, or it could be some kind of allergy (he hasn't had any new foods/medicines/washing powder/bubble bath etc. recently). She prescribed him a 3 day course of steroids (obviously, I'm not massively enthusiastic about the steroids but the poor child was in misery) and a different antihistamine called Loratadine. Today he's fine, no recurrence of the rash, but the GP said if it keeps flaring up she'll refer him to see if an allergen can be identified.
Does anyone have any experience of this?