Hello!
Typically it needs drained in order for it to go away.
Has your vet prescribed any medications? We often do antibiotics, anti inflammatories etc. to get everything calm and feeling better.
Is your kitty scratching? If so, add a cone in. If very active, maybe ask your vet to add in a sedative to keep calm while the ear tries to heal.
Hello,
If the first round of antibiotics isn’t helping I would consult about a blood work being done to look at internal organ function. If that isn’t helpful an X-ray to look for a bladder stone or ultrasound is the next step. Before trying multiple antibiotics you. An also ask about a urine culture and sensitivity test.
Ask about these.
For cats with persistent blood in the urine I worry about idiopathic cystitis which is best treated with a diet change to a urinary prescription diet and anti inflammatories, or, bladder stone which is either treated by a prescription diet based on what kind of bladder stone I think it might be (this is based on urine ph and appearance of the stone on X-ray) and cancer.