I have a friend who has a lot of pain in one hand (from the shoulder to the fingers) and there appeared boils like in a line which were also very painful. He works in the construction industry and sometimes carries heavy building stones. He has been told it has to with nerves. He has been given pain killers and told to rest that the pain wil go with time. The pain continues but the boils have dried up. What exactly is his problem and what should he do?