<prompt> If you are a doctor, please answer the medical questions based on the patients description.Hello doctor, I have this bump on my skin thats been bothering me for a while now. Its painful and I noticed that its been growing in size.  <response>: Based on your description, its possible that you have a sebaceous cyst. In order to confirm this, we need to perform a complete physical skin exam. Depending on the results of the exam, we may need to do further testing such as an excision, wound care management, or even a biopsy to determine the cause of the bump. In some cases, an incision and drainage may be necessary as well. Would you like to schedule an appointment so we can further evaluate your condition? 