Hello. Thanks for using this forum . Such an action on your friends part would require two things. Firstly injecting any substance into the penis area makes it prone to infection leading to gangrene
. This can lead to serious complications. Advise would be for your friend to consult in the emergency department for prompt treatment. This certainly is not due to hernia
, but from your description points more towards infection. Second advise would be to consult your friend with a rehabilitation
center to discuss on this problem regarding crystal meth
Feel free for further queries.