Ear blister

I have recently felt what feels like a blister on the interior of my dog's ear flap.  I can't see anything either on the front or the back of the ear flap.  It is inside the flap and it seems to be getting bigger and heavier.  It seems a bit sensitive when I try to look at it...she doesn't like it, but other than that, it doesn't seem to be bothering her.  I looked for any kind of bite or exterior lesion, but I can't see anything.
what is your opinion?
Thank you.

[Brian C Hurley, D.V.M.]

Hi,

Sorry to hear your golden has developed a blister like growth on the ear flap.  Any time there is a growth that is changing for the worse, I recommend having your veterinarian take a look at it to determine what needs to be done.

This blister could be a infection, insect bite reaction, cyst, or ear flap growth.  By performing a physical examination, your veterinarian can determine the best course of action.

Thank you.