If it is small sore knots it could be trigger points , that is something you can 'test' on yourself.

here's some info links -
Triggerpoints and referred pain and stretching:

this one has a nice chart for upper body-
http://www.pressurepointer.com/pain_reference_chart.htm
http://www.triggerpointbook.com/index.html
http://triggerpoints.net/_sgg/m1m1_1.htm
http://altmedicine.about.com/library...ressure+points
http://www.drlowe.com./triggerpoint.htm
http://www.bodymindresources.com/car...horaciclab.htm

trigger points are different from the tender points of FMS.
http://www.sover.net/~devstar/define.htm