To immobilize your wrist or hand, a splint or brace might be employed. When movement causes discomfort or causes a cyst or tumor to grow bigger, this may be employed. Fluid in a lump may need to be drained with a needle in rare circumstances. A bone fracture near the lump may require fixation. For small lumps that are not causing problems, most people don't need to see a doctor. However, if your lump is painful or growing rapidly, see your doctor so he/she can check it out. The doctor will ask about your medical history and perform a physical examination of your arm to determine the cause of the lump. If necessary, he/she may order blood tests or an X-ray to look for other problems such as cancer. Treatment for a lump will depend on what type of tissue surrounds it and how large it is. 2 close observation. If it's a mass of scar tissue (called a fibroma), then surgery is usually not needed. But if your child has more than one fibroma, they may be signs of a more serious condition called fibrodysplasia ossificans progressiva (FOP). In this case, surgery may be needed at an early age to prevent further damage to the joints.