The lump which you feel may be either a fibro adenoma
or fibro adenosis
. They dont turn in to cancer. The boil which you mentioned may not be responding to the antibiotic or there might be an abscess
in which case the drug may not reach the abscess. So you may either need a change in antibiotic or an abscess drainage
accordingly. Till your infection settles you will be having painful axillary nodes. This needs good analgesics.
Dr. Mohammed Ibrahim