one thing that works for me is taking a lacrosse ball or a tennis ball or a golf ball and lay on wherever on your forearm the knot is located for about a minute or so or until pain subsides. (I used a golf ball because it is smaller and it is easier to get the trigger point). I also no longer have elbow aches on my right arm after doing this.
Tennis Elbow Trigger Point Index
for other muscles if you are interested.
Index of Trigger Point Diagrams
I like it that trigger point massaging works, has worked for every pain in my body so far except for when I sprained my ankle one time dancing (minor) and my chiropractor had to put it back in alignment (mine was an alignment issue and yes the pop was loud). it sucks that massaging does not work for sprains or strains though and to get things back in alignment without having to go to my chiro a half hour away (the only good one I know in southern california that wants to heal people and knows what hes doing)