My son has a chlosteatoma and is been treated by an Ent surgeon he is on anti biotics ear drops at present to try and settle it before he faces surgery which will be about 3 months time last night however shortly after I put ear drops in his ear old blood and was mixed cane from his ear is this normal or is it something to worry about?he's has had surgery few years ago so this is his 3rd time with it I can not remember thus happening before though any one have this ever ?