Discoloration And Cylinder Size?

Thanks in advance to anyone who can help. I know this sounds like a newbie questions but I can’t seem to find an exact answer.

I’ve gotten some discoloration for about an inch or two right below the circumcision scar. It seems like it only happens in the area where the skin isn’t touching the cylinder(AKA the part that’s not packed). If I use a 2” cylinder some skin gets sucked up and the base of my dick will pack the tube up until about two inches below the circumcision scar. So it seems to me that the discoloration only happens at the part where the tube isn’t packed. If I use a 1.75” tube I can pack it completely and go as far as using like 10-12hg with no discoloration at all, but then I feel like it may be pointless to use a tube that I pack because there’s no more space for growth.

So my questions are:
1- what causes the discoloration and how can it be avoided?
2- is it still helpful to use a tube you completely pack, or does it need to bigger to get girth growth.

I think the discoloration is due to blood products that have escaped the veins and arteries. A good example of this in medicine would be looking at older people who have leg swelling. Over time the swollen ankles become darker due to blood products.

https://emedici ne.medscape.com … 813-clinical#b3

Anyone have a different explanation?

See for me its the opposite. I only get the dark purple spots on the bottom of my shaft towards the base. I also suck up some skin from my balls and this causes me to pack probably half the tube. However i ONLY get the discoloration where the skin is sucked up and the tube is packed. On the bottom of my shaft where there is no packing i get NOTHING. So damn weird. I think its because the pressure of being jammed up between the tube and my dick makes that area bruise. It usually takes 1 to 2 days to clear up.

I almost always experience discoloration or spots when pumping, all either at or below the circumcision scar. Even though the tube is packed I still experience this. It does go away with 2 days, but is still a bit annoying. Would love to know if anyone knew a way to avoid this, but as far as I’ve seen it’s unavoidable.