Can anyone help my left side of my neck has been swollen over the clavicle bone for about 4 months and a small lump in my neck their is no pain however I did have a lump on my left breast at the start of the swelling that has gone but my breast still has a red mark were it had the lump I am 50 years old fairly fit for my age apart from osteoarthritis in my right side of neck and shoulder hips and knees could this be a sign of cancer