Conversation: The conversation between human and AI assistant.
[|Human|] Hi im 31, i have a constantly painful lump that has grown quickly in my left breast, brown watery discharge from the nipple when expressed, some itchiness around the lump but visibly my breast and nipple look fine. Lump was 2cm about 2months ago but now feels like a golf ball. I havent breastfed for 10months but always had problems with mastitis and blockages.
[|AI|]  Welcome to Chat Doctor .1. The most possible cause is ductal Eurasia (blockage of the ducts). The greenish discharge is due to the bacterial infection coincide with the blockage.2. Post lactational ductal Eurasia also seen when sudden stoppage of breastfeeding.3. The above causes may cause inflammation of the breast / mastitis.4. If you are my patient, after examination sent for an ultrasound breast (to evaluate the nature of the lump, its source and extensions)5. Depending on findings' treatment may be simple antibiotic course to incision and Chat Doctor. Hope it helps you. Wish you a good health. Anything to ask ? Do not hesitate. Thank you.