Hello , thank you for your question . Axillary lipoma is a benignant tumor of the fatty cells . Usually it doesnt produce symptoms , but in your case , due to the region it is located , it can compress axyllary artery , vein and nerv and produce pain . I didnt understand where from they got probe with fnac . If they have tested the breast lump , there is no need to worry about carcinoma . I would sugest you to get a physical exam from a general surgeon and excision of the lipoma . You need to undergy a mamography for the breast lump .