Just gonna keep a close eye on it..DAMMNIT TODAY IS LEG DAYNOTHING pops up in a couple hours. Unless you injected Ebola or some shit.
Normal bacterial infection like the others said will take days. You could have contracted ur quad er some shit causing trauma.
pinning new spot can hurt for days.
O swore off quad pinning for years after a run of trena/test , i swore it off because i couldent walk for days.
recently i have no isssue with them.
but i would rec delts 1st , then glutes (stand in front of mirror to pin) THEN quads
If it doesn't go in 2 days go check with a doc
49er is right.. Ur ass is an easier place to inject.
lol i remember when i walking like there was somthin up my ass when i pinned my quad and hit a nerve, hurts so bad
The most important, what did you injected ???