Conversation: The conversation between human and AI assistant.
[|Human|] Hi I have a large pretruding lump in the curve of my back above my bum. Its extremely painful and seems to be getting more swollen. There is no difference in colour as I have suffered with cellulitis a few times and thought it might be that. Im not sure if I have maybe bruised the bone?
[|AI|]  Welcome to Chat Doctor. 1. The most possible cause could be infective cyst / hair follicular infection with collection with in.2. Second cause could be ganglion from the spinal joint space, other possible cause could be lipomatous.3. Fur further evaluation ultrasound will be helpful - which will evaluate the nature of the lump, its source and extensions. 4. In case of infective etiology a course of antibiotic will help - larger one might need a small incision and Chat Doctor.  5. In case of mass lesion an FNAC - fine needle aspiration cytology to evaluate the nature of the cells involved. And treated accordingly. Good luck. Hope I have answered your query,anything to ask ? Do not hesitate to ask.http://doctor.ChatDoctor .com/doctors/