Any time I diet, especially if it's with gear, I end up itching a lot, especially my back and chest. This can happen with or without Tren. I don't have a full explanation for it but one thing I've always wondered is if it has something to do with my metabolism going at a stronger and enhanced rate. For example, I could use the same gear while in a bulking phase and the itching will not happen, but when it get into diet mode, after a month or so once my metabolism is really going the itching can become annoying. It usually happens when I first start training as my blood gets going. The worst is if I'm doing early morning cardio, that's when it hits the hardest but regardless usually passes after 15 min or so give or take.

Like I said, I don't have a factual answer for this question just this theory but I've always been curious about it.