Hello, Recently my boyfriend and I started injecting drugs and in doing so I ve started (almost every injection) noticing these hard bumps under his skin, sometimes they are red and almost always swollen, I know that s a missed shot, but now he s getting these blisters on his arms, a few of them look Like they may have puss building up on them, in the crook of his arm and wrist. We have no insurance and can t afford to go to the hospital, please can u tell me what is going on ? How to fix this. Thank you