thanks for the info guys.
To comment on what someone had said - it's true that once there's scar tissue it doesn't leave. but when it forms (due to injury, needle injection, etc) it lays itself down in a haphazard manner. Massage (friction technique specifically) with stretching and ice can help realign the collagen fibres (ie. scar tissue) into more appropriate lines of stress, to help maintain range of motion and tissue pliability etc.
I never would've thought that massaging someone's injection sites would be beneficial, but ya - it totally makes sense.
Here's my pro-massage comment for the day hahaha: muscle is surrounded by facia. Massage can help to release facia which in turn enables the muscles to relax a bit more. My client commented that after I had worked on his traps for part of a treatment, that they felt and looked bigger. It's not that massage has anything to do with muscle hypertrophy, but it can help to restore muscles to a more appropriate resting length, which as a result can make them look bigger.
If you happen to be in Ontario, Canada, go to College of Massage Therapists of Ontario
, and search for an RMT in your area!