Hi, I have a small-ish, liquid filled sac protruding from my anus, and by that I mean it s coming out of it... I ts maybe like 1cm in diameter. It s skin coloured and squishy when I poke it. I can feel it when I sit or move around, it s uncomfortable but not excruciatingly so. What could it be? I m 25, weight 57kg, I have no problem with going to the toilet, I eat health and work out regularly. I had an operation in June for an anal fistula.. Could this be the cause?