What are the cons of an internal bra? My surgeon said you can get asymmetrical breasts.

I would like to know all the cons of an internal bra. My surgeon said you can get asymmetrical breasts with an internal bra. But how big is that change? And do you feel an internal bra when touching the breasts? Does it hurt more? Do you need more recovery time? I guess i should ask him those things, but he told me that if I did not use an internal bra, my breasts would only hang more...but bottoming out and hanging aren't the same to me...So I hope that your knowledge can clarify things for me.