Hey guy's, here's the deal, recently I've been getting sore welts under the skin at my injection sites.

I shoot 2ius am and 2iu's early pm.
I haven't changed my source.
Haven't changed any of my needle procedures.
Using sterile technique and bac water.
Been using blue tops for about 4 1/2 months now.

I'm wondering if my blue tops are likely 192's and I'm developing antibodies?

Any thoughts?