Six days ago I was taking a shower and when I was cleaning my butt I noticed a lump: it was really small and purple-ish, but didn t hurt or anything. Today, six days later, it feels like it has shrinken -- doesn t feel exactly like a lump anymore, like it has spread and gotten smaller -- and it still doesn t hurt but I noticed a purple line that is in the middle of my butt crack and has like 1 inche. It had never seen it before today. If it helps, today I exercised and ran a lot and I am not used to do that. Please help me. Is it serious? Will it go away on its own or should I hush to the doctor?