S having multiple lumps found in your breast and arm pit a cause concern even if they keep coming back benign...?

Depends: The question is what is "benign", i.e. What does the pathology report say? Why does this keep happening? You need to ask your doctor these questions. You may need to get a second opinion and seek out a breast specialist.

Maybe: Usually having multiple lumps are due to benign conditions. However, a new lump may not be necessarily benign. Your condition is more complex than usual due to repeated episodes of developing breast and axillary lumps. You need to have regular breast and appropriate imaging exams by your health care provider to assure any new lump that you develope is in fact benign and not malignant.

Possibly: The critical detail in my opinion is whether the benign diagnosis explains the multiple lumps in your breast and armpit. I agree with what has been stated in that just because one lump is benign, does not mean the others are, as well. Clinical, radiographic and pathologic correlation of all findings is mandatory.