Today I discovered a blue purple spot at the top of my butt near the crack. It isn't raised but it is sore when I touch it. What is this? I don't remember falling so i dont think it's a bruise.. I'm very nervous about it because I had an abscess around this time last year and I had to have it lance which was very painful and i dont want to go through that again. However, this bump looks quite different from the abscess I had. Please help!