Suggest Remedy For Hard Lump On Butt Cheek Due To Fall

Hi, I fell down a flight of stairs during the summer, and got a giant bruise on my left butt cheek. I went to the doctors and he gave me something for the pain, and the bruise healed surprisingly quickly. Now, the bruise has been gone for months (almost a year), but I still have a hard lump that s a bit smaller than an egg on my butt. I was told that it would go away, or at least get smaller, but it hasn t. I m feeling very self consious now because my butt is lopsided, and so I haven t been able to wear some things I would like because I m afraid someone will notice. Is there any way to make it go away? Some more information, the bump hurts sometimes, not often, but it does get sore. Also it s kind of far from the surface so it s a bit harder to feel unless you really press down. Please, don t rush to answer because I m sure there are way more serious problems here than mine, but I appreciate the answer when you do get back. Thank you.