Flash: Heat generated inside case a problem?

Should I be concerned about the amout of heat generated by the flash inside the cases for point & shoot cameras? I wonder whether the expansion of air inside by increased temperature leads to fogging or even leakage? Will it force air out of the housing and then cause a vacuum as it cools?

Don't worry about it. The pressure increase is much, much smaller than the water pressure. I have had mine closed on a flight and found it under vacume when I arrived. It was hard to open but no damage.

Thanks!