I'm not sure that the flying would cause the scar tissue to expand on your eardrums, or have any effect on the scar tissue at all. However, the pressure changes that you experience when flying can affect your middle ears, and can sometimes cause discomfort during and after your flight.
The scar tissue on your eardrums, which is as a result of multiple ear surgeries, rather than frequent flying, can definitely cause stiffening of the actual membrane that makes up your eardrum, which results in limited movement of your eardrums. This in turn can contribute to a hearing loss, as your eardrums need to be mobile in order to carry sound waves from the outside world into your middle and inner ears. If you have not yet had your hearing tested, I would recommend enquiring with the ENT specialist when you see him again about your hearing. He will most likely refer you to an Audiologist.
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