Hi,

If the tightness is in the brachialis muscle, it is because you are having Myositis Ossificans.There is warmth, restrcition of motion and swelling on the affected area. It is commonly seen on the quadriceps and the brachialis muscle. Joint mobilization, eccentric strengthening of the biceps and brachialis muscle are necessary.

Here is a link about the rehabilitation process of Myositis Ossificans.
http://www.pubmedcentral.nih.gov/pag...geindex=2#page

Do not fret and make sure you go and find a good physio.

Goodluck,
charlize29