HELP!! My friend missed a little when shooting up suboxone, what are some remedies?

So I was wondering if there are any at home remedies to help treat a spot where my friend missed when trying to shoot up suboxone.???
He was shooting it up in his leg and he missed a little bit, not much because he instantly felt a burn and stopped. When he pulled the needle out he bled quite a bit and a little bump appeared. The next day a dark bruise formed around the injection spot. It has been about a week now and the spot is still very tender and it is very bruised and red all around it. He has no red lines going up his leg and no more bump. He describes it as feeling like a scab is forming, but its underneath the skin. He has not gotten a fever and the injection spot is not hot either.

Is there any at home remedies to help relieve his pain? Should he go to the hospital?? Should I be seriously concerned? When will this go away if its not that serious? He would rather avoid the hospital trip because he is scared that they will pull his prescription if they find out. We would rather self treat this, however possible.

Any suggestions or insights would be greatly appreciated.

Please no responses about not shooting up, I am on the same page and this situation has finally convinced him to stop. But like I said, it has been about a week and it hasn't gotten any better and I am concerned.

Thank you
 
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