Expert answer:
If you know the size of the lump it is because you have done some examination and in this examination should have appeared other things that your doctor can be based to know if the lump is benign or is a malignant tumor, then ask him when to show the exam . At your age most of the nodules are benign nodules, I do not know exact figures, just so you have an idea that most breast lumps at your age are actually benign.
