What are the symptoms of a fistula. I noticed something pop out in my left buttock several times, but it would go back in. As of yesterday the pop out is staying. A lump. I seem to have some anal drainage now too. No pain, really. Almost looks like things are gathering to a large ish head. No pus but it looks irritated. Maybe from ice when I thought it was a bulging hemmeroid. Then I applied heat. After walking the golf course it looks slightly bruised. Is a doctor visit necessary? I have many outer, big hemmeroids that seldom if ever bother me.