http://az.essortment.com/typesrashesski_rnnu.htm says the following:
"Complications can occur with rashes, such as a mosquito bite being scratched and bacteria can invade it, causing imetigo, also known in layman's terms as indian fire. If blisters or pus forms, the rash gets worse instead of better, or if fever develops, see your doctor. There is probably a secondary bacterial infection such as staph, and you may require antibiotic treatment."
Creatinine, urea and urate all increase as the ability of the kidneys to filter fluid within the body declines. This is irrespective of the cause of reduced efficiency of the kidneys.
The most common reasons for developing raised creatinine levels is when the filtration mechanism becomes gradually damaged by long-term raised blood pressure or diabetes. In any severe feverish illness where the person gets dehydrated, there may be a rise in blood creatinine levels as the kidney tries to deal with the breakdown products of proteins in our bodies. Acute renal failure may result from trauma, blood loss, serious infections, poisons, some cancers and biochemical imbalances, to name but a few causes.
As the kidneys become increasingly unable to cope, so the creatinine level rises. A reliable measure of renal function is often expressed to doctors by a creatinine clearance test. This involves a formula that expresses the blood creatinine in relation to the amount of creatinine produced in the urine over a 24hour interval.
Have the follow up doctors look at other tests including urine examination for biochemistry and microbiological content, and sometimes even biopsies of the kidneys.
Due to the long term nature of his condition I think you are prudent to go to a specialty clinic as you mentioned.
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