Hello. As per your information , you must be having Chronic Kidney disease
requiring dialysis. The cause of kidney failure as commonly is, may be diabetes,Chronic glomerulonephritis
, Chronic interstitial nephritis
or it may have followed Acute kidney Injury. HSP is a condition of childhood with peak incidence in first decade of life and its unlike that the cause of the rashes you are having or the kidney disease is HSP. In Chronic kidney failure, the is usually platelet dysfunction
that can cause the purpuric rashes that have appeared on your feet. You may have decreased platelets or some vasculitis
. I guess your kideny specialist is going in the right direction. Take care and have a good health.