I have had several of the normal experiences. Tingling, warmth, redness in the hands.
A more odd experience this time, however, is that the redness "blotching" extends beyond my palms. It has varied with each time. Once it covered the entirety of my forearms, from around my elbow down, other times it covered a bit less, and most of the time it covered at least the back of my hand as well as my palms. The extent of it has varied, but it has happened every single time this week, so far.
Kouji, I have given some thought to this, and I have considered--might this be another manifestation of a yang imbalance? The more standard option is that I am simply very sensitive to energy, and my body reacts to it accordingly. But, in a yin vs yang balance discussion as was brought up this week, I have most of the symptoms of too much yang, even some that you did not mention that I read elsewhere. Along that line of thought, this reaction seems to fit.
In any case, I thought it was interesting that it did it this time, because I practiced this exercise before when I dabbled with the qi gong articles a couple of years ago, and the redness didn't extend beyond my palms at that time.