Hello, Thanks for your query. After an injury to any part of the body there is an inflammatory response. Part of the inflammatory response involves the release of certain chemicals. These chemicals cause initial swelling and eventual fibrosis (the formation of scar tissue). During fibrosis the area can become firm or hard , it also becomes non tender. It is likely that the bump that you are seeing is as a result of scar tissue formation. The scar tissue or fibrotic area can continue to remodel itself and become smaller but this can take a few weeks in some cases. In some persons , it can actually take a few months for the area to return to normal. Normally observation is the only suggested treatment unless it is bothersome to you. If this is the case then the use of ibuprofen, cataflam, aspirin, mobic or celebrex. All of these are taken on a full stomach. I do hope that you have found something helpful and I will be glad to answer any further query. Take care