Two possible causes of a lump on the clavicle include osteomyelitis and a bone cyst, according to Right Diagnosis from Healthgrades. However, people are recommended to talk to a doctor regarding symptoms as there may be other causes.
Osteomyelitis is a rare and serious condition in which the bone becomes infected. This may happen through an infection in the bloodstream that spreads into the bone or an open wound or surgery that exposes the bone to an infection. Staphylococcus aureus, a type of staph infection, is the most common cause of osteomyelitis, explains WebMD. Chronic conditions such as diabetes may increase the risk for getting a staph infection. Other conditions that may lead to osteomyelitis include sickle cell disease, rheumatoid arthritis, alcoholism and poor blood supply.
In addition to swelling of the infected bone, symptoms of osteomyelitis include a fever, irritability, fatigue and nausea. Other symptoms are tenderness or warmth in the affected area and a loss in range of motion, states WebMD. This a hard condition to detect and requires a bone biopsy to confirm a diagnosis. Antibiotics are the most common treatment and are administered through intravenous means for several weeks; the patient then switches to a pill form. Serious cases may require surgery or, in extreme circumstances, amputation.