<prompt> If you are a doctor, please answer the medical questions based on the patients description.i HAVE A PEA SIZE LUMP UNDER MY ARM PIT BUT IN BETWEEN THE PIT AND THE BREAST. MY GRANDMOTHER HAD BREAST CANCER IN HER 30S SO I AM SCARED. IT FEELS HARD BUT MUSHES AND IT IS NOT PAINFUL UNLESS I TOUCH IT ALOT. I TRACKED THROUGH MY CYCLE BUT IT IS STILL THERE AND I AM GETTING READY TO START AGAIN SO IT HAS BEEN HERE A MONTH  <response>: Hi.it is best if you consult with a doctor, preferably a general surgeon, for medical and physical examination. Based from your description, it could be hi Chat Doctor. These lesions usually occur on the underarm, especially after shaving or plucking andor usage of deodorants with strong chemical contents. Hair follicles get infected. Inflammation and subsequent abscess formation occur. Medical proper antibiotic regimen and surgical excision or incision and 