sounds like an acute inflammatory/immune reaction brought on by unclean gear......use at your own risk...I personally have found that if I mix/dilute oil based UG gear with name brand gear it tends to lessen the localized reaction and NSAIDS and benedryl helped since I thought I was having a histamine reaction as well.
Word.
Like bravo said, it's just the initial inflammatory response and most likely the gear is dirty, rather than your practices being unhygienic.
You need to pick your UG gear wisely.....
Unclean gear will cause you problems.....
I have seen kids develop tumors in their neck from dirty Tren.
DIV