When it's exremely hot, red bumps of different sizes (ranging from pinhead size to larger) appear on the first joint of my fingers, and spread. These last almost a month and go away on their own. They're itchy, but not painful. Is this caused by heat or is it something more serious?
Oooh I get this too and have never thought to ask would like to know what some people say. I can say that I get them a bit in winter but more in summer.
You may want to check out the condition "urticaria" on your fav medical site.
I have cold urticaria, which produces the same symptoms (itchy hives & tiny bumps on my hands and arms) after exposure to cold, particularly moist cold. But there's all different types of urticaria, including heat and solar urticaria.
OMG lol! I came to this site cos I searched for "finger bumps" (itchy little b***ers are driving me mad). I was just reading through this thread and found it rather amusing cos I am from Norfolk too. Maybe there really is something there!