"My skin is freaking out! How do I know whether my breakouts are from stress, diet, or
a combination of both?"
In my experience, when someone says, "My skin is freaking out!" it usually means that they're experiencing breakouts and dryness at the same time.
Testosterone is the hormone responsible for oil production in the skin. Oil glands are bigger in the T-zone area of the face, while in certain places (like the sides of the chin) the pores are smaller due to natural facial contours.
In the case of stress, an adrenaline rush can produce an overwhelming amount of testosterone, which in turn produces an oil rush to those T-zone pores. If your skincare routine is either pore-clogging or dehydrating, the oil can't come through onto the surface of your skin. This back-up of natural oil is what results in a nasty, irritated breakout. With non-clogging, hydrating skincare products, the skin is more pliable so less oil is held back. If you break out primarily around your mouth, chin, and forehead, stress is likely going to be the primary problem.