<s>[INST] Hi my name is Dee and I found a hard lump on my left breast close to my chest, its sore right now, but I keep feeling to see if its gotten any bigger from this morning and yes it has its getten slightly bigger.... Im sure we dont have any family history in my family too.. What do I do??? Or what will it be [/INST] Welcome to Chat Doctor. 1. The history and symptoms suggest the possible cause could be breast abscess which is of infective etiology - painful sore breast.2. In case of hard and not very painful the causes all be breast cyst, ductal Eurasia, mass lesions.3. In any case you need to get an ultrasound examination done which will evaluate the nature of the lump its source and extensions.4.in case of mass lesion an FNAC - fine needle aspiration cytology need to be done to know the nature of the cells involved. Depending on the age mammogram correlation needed for the tiny / micro calcifications.5. Suggest to get appointment with your GP, get examined and needful investigations and treatment accordingly. Good luck. Hope I have answered your query,anything to ask do not hesitate to ask.http://doctor.ChatDoctor .com/doctors/ Chat Doctor.  </s>