Red spots on glans keep coming back after hanging

I started hanging 6-7 months ago with the male-hanger. Started out with 2.5lbs and worked up to 20lbs at 2.5 per week, 20 min sessions totaling 7-9 hours a week. BTC and straight out.

I noticed red spots on glans getting darker and darker till they were raised slightly. Look like blood from capillary beneath skin. I have taken off as much as 4 weeks with no activity and they fade until they are very lightly colored almost unnoticeable. But they keep coming back after I start hanging again.

I even tried going back to using my andro- extender that I originally started PE with years ago, but it also causes the red spots to come back.

I tried hanging because after my newbie gains of 1 inch from about 9 months of extending, I wasn’t seeing anymore gains. I was told that I need to use hanging to get extra gains from this point. What can I do? Are other hangers less likely to cause this?