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Erythema (from the Greek erythros, meaning red) is redness of the skin or mucous membranes, caused by hyperemia (increased blood flow) in superficial capillaries. It occurs with any skin injury, infection, or inflammation. Examples of erythema not associated with pathology include nervous blushes.
A hydronephrosis is when the the pelvis of the kidney and eventually even the calyx becomes dilated as the fluid accumulates within it. Hydroureter is a dilation of the ureter as the urine accumulates within it and causes distension. A hydroureter is unlikely to occur with a blockage at the ureteropelvic junction â this is where the kidney (renal pelvis) and ureter meet.