Hi Thanks For Contacting ! Well , Dear the growth that you are describing in your buttock area can be a simple skiing tag , or a wart or a simple pimple . These few things are required in your history . Do you have any associated symptoms like rectal bleeding of pain ? Are you homosexual ? What s the exact time when it appeared ? Is it only one or there are many others similar growths on your body ? For the time being , I would suggest you to avoid constipation , wear loose cloths which allow air passage easily , apply Cream Clindamycin on the growth that just popped up to avoid any secondary bacterial infection and keep the area clean . Thank You