Signs of Scar Tissue?

I inject in my shoulders E3D, alternating shoulders. My left shoulder when I inject doesn’t bleed at all and has a bit of a sensitive feel after I put the needle in. Is that a sign of scar tissue and does that impact my bodies ability to absorb the test? BTW I use a 1/2 inch length needle,

My scar tissue feels like hard grissle, lots of hard resistance when I inject, and lots of pressure to depress the plunger. I pull out and start over

A little PIP isn’t scar tissue