I have a painful lump between by butt cheeks and it s gotten worse everytime, I had it for a week already, Monday it just appeard, Tuesday it hurted me to sit down, Wednesday I couldn t lay down on my back anymore, Thursday was the last time I ever sat down, by Friday I couldn t even stand or walk straight, Saturday I was the last time I slept on my sides at night, and now I have to hold on stuff in order to walk, I am slouching and it s causing my back to hurt, I shake when I walk and I get nausea once in a while, I just checked the lump and it s squishy, I am a 16 year girl and afraid if it s something serious.