Any time you hae bleeding from your ear you need to consult a doctor. I to had this problem and found that it was something I had to have surgery for. An Ear Nose and Throat Dr would be your best choice.
i dont think it is normal you shud see the doctor.
There can be many causes such as Barotrauma, Boils, Ear condition, or some traumatic head injury. Seriously you should consult a doctor. Causes are many and only a doctor can provide a correct diagnosis.
Good luck.