this sort of thing is a common occurance when injecting.swiy might have missed a little, had the arm tied of to tight or sometimes viens just blow. when one gets blood under the skin its always a bluish lump. as people have said don't panic. the main thing is if swelling gets bigger, goes red and/or is hot too touch then watch it closely and get it seen to if its getting worse. Abcesses are qute rare and usally only occur if one does a dirty hit or misses with chalky mixture.
remember injecting pills always has it dangers and these things are bound to happen,
hopefully swiy will get away with a sore arm this time.
injected different plls for years and escaped with just a lot of collapsed veins but considers himself extremly lucky. i hope swiy stays lucky
There's a god thread on injecting that maybe swiy should read as it puts the dangers into perspective.