Meeting with a dermatologist

Hello,

I have an appointment with a dermatologist this thursday and looking for some help. I have reoccurring rashes under my panni and breast for some time now. I have been to my PCP and she has prescribed creams but they just keep coming back.
She suggested I see a dermatologist for these rashes in hopes that he can determine that these rashes will never go away without  medical necessary plastic surgery.

Im looking to ask him questions to help in getting insurance to pay for the surgery. Does anyone have any pertinent questions I can ask him to help with this process?

Thanks in advance!