Breast Lump or Cyst -- Feel Different on Palpation?

Thank you for the wonderfully informative site.  I've read that cysts and other benign masses feel soft or rubbery and are generally regular and/or round in shape.  Does a malignant palpable breast mass generally feel differently than a benign breast mass and does the shape of a malignant mass generally differ from the shape of a benign mass?  Thank you very much.

[CCF-RN,MSN-JS]

Dear query, A woman