Hello and thanks for posting,

To begin with, I think that you should be reassured by your GP, as they are experienced in assessing lumps and skin issues.  Armpit skin/lump issues are not generally common symptoms of breast cancer. If your GP had been concerned, then she would have made an urgent referral to an NHS breast clinic. Ibuprofen would help with any inflammation in the area that might be causing soft tissue swelling, so it is worth trying for a week or two. You may have strained muscle or tissue in that area. Sometimes fluctuating hormone levels can cause some soft tissue swelling too. 

As nurses, we cannot specifically advise you as to what you may wish to do. If you think that it would help put your mind to rest, and reduce worry by seeing a breast surgeon, then maybe discuss with your GP about arranging that.

Best wishes,

Vanda