<s>[INST] Hi Im a male, and have developed tenderness around my right nipple which has been present for the past few months as of late Im starting to feel a stinging sensation around the same area, any idea what this could be? daniel YYYY@YYYY [/INST] Hi. Welcome to Chat Doctor. Well, it needs a clinical examination to come to the exact diagnosis.However, the differential diagnosis for pain and stinging sensation in one nipple may be.1. Bacterial mastitis.2. Local trauma.3. Hematoma formation.4. Boil. And accordingly you may have to use a good analgesic along with oral antibiotic to get the relief. Hope this helps. If you have any other questions, then I will be happy to answer them. Take care. Regards. </s>