hard to say , a couple days ago i was injecting and the plunger was realy hard to push , and it kinda slipped from my hand and the whole pin cam right out of my arm . i got instant pip and it hurt like shit , it was delt , the whole day my arm hurt and got hard and knotted , not a lump however , went away in 3-4 days . another time in injected quad and the next day i had a boig red area right below where i pinned and my leg hurt anf felt bruised and hard to walk on . wierd thing is i actually developed a bruise near my knee cap a few days later . i pin upper outer quad so kind of wierd the bruise was so low , big red area and a bit swollen and maybe a bit hot and itchy too . once again however , there was some swelling , but not a lump as u say , and it went away in 3-4 days .