You must be looking at a lot of old posts. Not very common nowadays. Don't skimp with cheap BAC from amazon though, that defo can cause welts. Trust me

I see this with liquid version this happens more than powder version to some people. Also like Greg said it could be 192AA

There's good SRC's here for GH , just give it a try. Don't let a red welt possibility scare you

GH comes in 2 forms, 191aa 192aa

The 191aa is identical to what your body produces.
192aa is cheap and easy to make, most of the 192aa GH comes from China. 192aa is manufactured through an "Inclusion Body technology" (google it). 192aa has been known to cause allergic reactions (e.g., red welts) in some users.

I had this problem until recently. It is possible my body finally got used to being injected with a small percentage of containments but the main change I made was adding more bac water to the powder. There's a post by godtropin explaining how it works. I've also been told another scenario that it has to do with osmotic pressure and the increase in bac water fixed it. Topical benedryl works on those welts but I haven't had any major ones since using more bac water then before. So instead of 30 ticks use 60 ticks for the 3iu for example. I never got welts using the top sources of pre-mixed GH, only generic fyi

Sometimes its the water that comes with the kit. Switch it out and see what happens

Could be better ghetto gear. Sometimes your body has to get use to it. When my wife first started using it, she would get little welts. After a week, it completely subsided