Hello, thank you for your question regarding discolored areas on your buttock after biopolymer injections. Basically, biogel is a foreign body. Your body is reacting to this foreign body and creating scar tissue. This is an inflammatory response. During the inflammatory inflammatory response, the skin changes color. Additionally, your body is trying to reject the biogel. Your body is trying to reject the biogel by creating a path from the biogel to the skin (sort of like a volcano). However, the bio gel is caught in so much scar tissue, that your body cannot eject the biogel. Therefore, there is a constant cycle of your body trying to create scar tissue around the biogel, rejecting the bio gel, and the skin trying to make a path to expel the biogel. In addition, there is usually localized infection. The best thing to do is to have the biogel injections and the associated scar tissue removed. If the masses are small and soft, the biogel and its associated scar tissue can be removed with intra-operative, ultra-sound guided, VASER assisted liposuction. If the masses far more extensive, you may need an incision either on top of or under the bottom of the buttock.I hope that I have answered your questions removing biogel from the buttock. Before you make any decisions regarding biogel removal from the buttock, I would suggest you seek consultation with an expert. Please seek an experienced, board-certified, plastic surgeon. Travel out of state if you must to find such a biogel removal expert. If you have any more questions regarding biogel removal from the buttock, intra-operative ultra-sound guided VASER assisted liposuction or plastic surgery in general, please contact my office. Sincerely, Dr. Katzen. (Certified by the American Board of Plastic Surgery and member of the American Society Plastic Surgeons, International Society of Aesthetic Plastic Surgery, American Academy of Cosmetic Surgery, and Fellow of American College of Surgeons and American Board for Metabolic and Bariatric Surgery, Awardee: RealSelf 100.)