Thanks for choosing health care magic for posting your query.
I have gone through your question in detail and I can understand what you are going through.
it seems the place where your friend has taken a meth
shot has become infected. if the same has occured immediately after taking a shot it is possible that it could be an allergic reaction
. Your friend certainly needs to take emergency treatment from the ER or else it can get worse.
Hope I am able to answer your concerns.
If you have any further query, I would be glad to help you.
If not, you may close the discussion and if possible you may rate the answer for me, so that I get a good feedback.
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Wish you good health,
Dr. Srikanth Reddy M.D.