Royal distraction of the day - what's up with Charles's swollen hands?

I know we ink-stained wretches are supposed to be concentrating on the worthy side of the royal tour of Australia - but when Charles was signing a book at a racecourse in Melbourne today it became impossible to ignore his swollen and possibly sunburned hands any longer.
That looks sore.
Charles has clearly forgotten to follow the Aussie code of slip, slap, slop - slip on a shirt, slap on a hat and slop on the suncream.