Blood in the urine may be due to several factors. Strenuous exercises prior to obtaining a urine sample may lead to hematuria or blood in the urine. Urinary tract infections, urinary tract stones, and kidney inflammation may cause hematuria. Kidney problems may also present as skin conditions, thus, it is necessary to rule this out.
As for the skin rash, this may be a case of contact or allergic dermatitis. You may need to have this assessed by a dermatologist. Topical corticosteroids such as 1% hydrocortisone may be applied thinly on the affected area for 3 days. If no response or if the skin condition worsened, then you may need to have this assessed by your doctor.