<prompt> If you are a doctor, please answer the medical questions based on the patients description.I discovered a hard lump in my navel and removed it with twizzers and with a lot of difficulty it came out. The top that was exposed was black and very hard however, the end of it was about 34 inches long and soft. It was rather scary and now I wonder if I should take it to a doctor.  <response>: Hi, thanks for sharing your health concerns with Chat Doctor! If I were your treating Doctor for this case of an inverted hard navel lump, I would come up with two possibilities:1.a sebaceous cyst! Nothing to worry about this and try not to get infected there!2. A skin papilloma or fibroepithelial polyp or neurofibroma; these are also benign and not to worry at all! Well, this is a fairly common benign disease of the skinskin appendages ; however, in worse case it could be some neoplastic condition or lymph node also! I suggest you to go for an FNAC test of the lump for confirmation and to relieve your concerns! Hope this answers your question. If you have additional questions or follow-up questions then please do not hesitate in writing to us. I will be happy to answer your questions. Wishing you good health. 