A 63-year-old man presented with obstructive uropathy. His creatinine was 16 mg/dL, and his blood urea nitrogen (BUN) was 147 mg/dL. The image demonstrates uremic frost on his face.
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Uremic frost is seen in end-stage renal failure and is an indication for dialysis. It forms when sweat containing high levels of urea evaporates and the urea crystallizes on the skin. This finding was common prior to the widespread use of dialysis.