### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
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.

### output:

Hi! This is very common and please don't worry about this! Often I come across such cases of post-injury bumps here and there on peoples bodies and get few things to learn every time:1. These are old organized hematoma often gets calcification within them so that the swelling doesn't disappear, rather it hardens!2. It can get infected in case of any kind of manipulation resulting in an abscess3. Often these are forgotten, and only some complication reminds of it4. Underlying bone fracture might be there creating re-fracture in remote future!5. Some antibiotics may result in the formation of anti-bigamy and pains on touch due to hardness! But never malignant or any serious disease! Therefore, if still worried, get it to some surgeon for needle biopsy, x-ray and confirmation. Regards,