Help - a serious disease?

I live in another country than my friend so we can only communicate via the Internet and the phone. He's had some strange kind of rash and from time to time swollen legs for about three months now. He refused to see a doctor for a long time but finally went to see a dentist who told him that he got an infection due to his bad teeth and that he'd need to get some antibiotics from a doctor. He has not done that so far as I know and today is the third day in a row that I haven't heard anything from him. Neither has he signed in to the web pages he usually visits daily. I'm really a bit worried now because some time ago he mentioned that his disease was life-threatening (which on the other hand implies that he had seen a doctor, doesn't it?). Does anyone know something about this kind of infection or how dangerous it is? Maybe this is a strange question or I'm overreacting but I really worry about him. Only serious answers please!!!
Best answer:
probably it can be streptoccocal infection .causing glomerulonephritis that many be the reason for leg swelling . glomerulonephritis is an inflammation in kidneys due to antigen antibody reaction. the antibobies aganist the streptococal infection reacts with lining membrane of the kidneys filtering apparatus leading to this condition.even though it a risky situation effective drugs are there which can control it. he must timely seek proper medical help.
Best answer:
myself a doctor