I have a hard biggish like pimple / lump on the inner left cheek of my bottom, its not near my anus but i felt it when cleaning myself in the shower, it felt at firsy like a huge pimple so i squeezed it and it popped and a whole lot of puss and blood and blind pimple types of substances came out, the lump now feels hard like there is a rock under the skin or something, how do i fix this, do i need to see a dr??