Oh my - is it a miss?

So I have been running subutex in my lower arm. Some misses I can feel a slight bump but a bit of my arm is red and sore. I tried putting an ice pack on it. My friend that donates plasma suggested that. Then I tried using other arm and it's got a small miss - damn roller veins. When I hang my arms down by my sides they feel like they are throbbing . anyone know what it could be? Any suggestions ???? Thanks for any response