How can i tell if a breast lump is malignant or not?

See your Physician: This is primarily determined by a biopsy but the best non-surgical method is an mri. There may be certain symptoms that increase the suspicionsuch as skin dimpling, ulceration, lymph node swelling, etc, but a biopsy is inevitable to establish a definitive diagnosis.

Evaluation: The only way to tell is to have it evaluated. This could include mammogram, ultrasound, needle biopsy, or surgical biopsy.