As per your query,you are having multiple swellings over arms and armpits.Most probable diagnosis is Multiple Lipoma's.
I am sorry to say that there is no medical treatment.
Pain radiating to the breast is not due to these lesions.It is due to musculoskeletal pain
.Please use Skeletal muscle relaxants for this.
Get a swelling removed by your surgeon and send it for histopathological examination,i.e biopsy
The diagnosis will be confirmed.
If you come back after biopsy report,i will clarify further