I have a hard, immovable, painful, slightly blue lump on my inner forearm. It is about an inch long. Sometimes the pain goes down and up my arm, especially after use or palpation. A few months ago, my husband s oncologist said that it was a lipoma. The doctor today said that it was not a lipoma because it is too deep, hard, and fixed. Also, it seems to affect my middle, ring, and pinky fingers. What can it be? How likely is it to be malignant?