The idea Red had was that men who started pumping or clamping hardcore, without a progressive build up, ended up with worse discoloration than those who were more progressive. Iron in the blood can be brought through the tissue, to the lower layers of skin and become built up and become too large to be flushed out of the system which ends in discoloration. If anyone remembers, years back, I was working on a way to correct this through very powerful magnetics at a certain frequency of vibration. Since the blood contains iron is can be magnetic or neutral. My thoughts were if the blood becomes coagulated and is too big to be flushed back into the system the fastest way to correct this was through using magnetic vibration. Now this was not an easy task, it took much study in the mechanics of magnetism and how it effect our blood. After many months of study and trial and error I created a device that had the correct vibrational frequency with magnetics that were powerful enough to cause a break down and re-up of the coagulated blood. The device worked but it was far too dangerous and expensive to create a production model.
There is a thread on this that I can dig up if anyone is interested.