Quote Originally Posted by OakLeaf View Post
I am NOT a doctor or anything like it, and the usual cautions about diagnoses over the internet... but your description sounds like the triceps tendon?

Rest, ice and anti-inflammatories (both topical and systemic) are good (and be serious about resting for a day or two - yes it's extremely difficult to rest your arms, but really do it) - and I would look for trigger points in the triceps as well. You can massage them using a small-ish ball like a tennis or lacrosse ball, pressed between your triceps and a wall. "Search for the small spot of exquisite tenderness that typifies a trigger point. Six to twelve strokes constitute a treatment, but repeat the treatment several times during the day."

I just last week got the Trigger Point Therapy Workbook which has been highly recommended by several TE'rs. (which the above quote about general technique is from) It's DEFINITELY helping with my calves/ankles.
You pretty much said what I was going to say. And on a side note, isn't that book great? I've definitely found it helpful.