Hello AznB,
Thank you for using Apple Support Communities!
I understand from your post that you have a black spot on your camera when you use FaceTime. The following article suggests cleaning the camera lens and if the spot looks like it is on the inside of the lens to contact an Apple Retail Store or Apple Authorized Service Provider for additional assistance.
If the camera on your iPhone, iPad, or iPod touch isn't working - Apple Support
If your photos are blurred, out of focus, or have dark spots, make sure that the camera lens is clean. If you need to clean the lens, use a microfiber cloth. If you see dirt or debris inside the lens, or the camera lens appears to be misaligned or blocked, take your device to an Apple Retail Store or Authorized Service Provider for more help."
Best Regards.