a rash can be life threatening...you can go into anaphalactic shock which means you stop breathing (your throat swells shut) If you don't know the source or haven't experienced the rash before then it's better to be safe than sorry. It could have been serious.
Shortness of breath would be serious. Increased heart rate would be serious. A rash on it's own, with no further immediate symptoms (anaphylactic shock usually occurs instantly - not over a length of time - the reaction is usually within the first 15-30 mins, up to an hour if it's drug related), does not require the ER. Unless of course we're talking about a meningitis type rash, but that's a whole different ball game.
If a guy just gets an itchy rash on his hand, and no other symptoms - he can wait and see his GP the next day if it's a worry - or even phone them immediately if he's concerned for advice. If the doc says go to A+E - then he should take that advice. But dont fill up the A+E and waste the doctors and patients time if it's just an itchy reaction to something. If everyone did this, it'd be havoc. Minor symptoms like a rash on it's own are a case for the GP. If you feel it can wait, and it's out of hours, see the doc in the morning. If you're worried, give your doc a ring. If you're extremely worried - either drop into the GPs or call them out. But dont go to the A+E - the clue is in the title. Accidents and
emergencies.
Say if he'd pulled his hand out of the water, and within minutes had a rash, shortness of breath, tight chest, increased heart rate etc -
of course he should ring an ambulance then. But if he's an hour or two down the line with just a rash, it cant be a severe reaction.
Here's a good site for help - NHS direct. When I did the self help tool on there for rashes on hands, it took me through some questions, and I had a little play with it using what you'd described (original poster that is) - it recommended self care, but to see a doctor if the rash hadn't disappeared in 24 hours. If difficulty breathing occurs, ring 999.
http/www.nhsdirect.nhs.uk/help/bodykey/Q...jCb%2f9e8NW0%3d