Side effects?

I have been taking the recommended 3 tablets before my morning workout for around 3 weeks now and my immediate reaction was the sudden increase in amrterness and concentration when training, there is no doubt the caffeine boost works as I have seen a marked increase in my efforts in the gym and this along with a better diet is seeing me increase fitness and getting into better shape. However, I am intrigued to know if anyone can tell if any side effects of the supplement? Certainly in the last 10 days I have suddenly began to break out in terrible lumps and bumps on my face and neck, so much so I am visit the doctors tomorrow as it is quite worrying, is a larger caffeine intake causing this? The increase hormone and thyroid releases perhaps? If anyone out there can shed some light on this if he grateful as the supplements are definitely having the desired effect on training but will not sacrifice my personal appearance for quick weight loss, thanks.
Goes Well With:
A glass of water before workout.