For almost 10 months I have been experiencing a dull pain in my left arm about 3 inches above my elbow on the inner side. The pain seems to emanate either from the bone underneath or the nerves and is located at specifically one spot. I don't feel the pain all the time, only sometimes in certain positions or when pressing at the point (that too only in certain positions). In 10 months the pain has neither increased nor decreased. There is no lump underneath. What can be the cause?