question: Hi, I have a very large painful lump outside my anus. It developed overnight without any indication.i don't see any blood in my stools.very confusing to understand what it is. Have visited a surgeon and he prescribed some medicines. Have been using them for 10 days now and was asked to continue the same for some more days.currently, size of the lump has come down to almost half of what it is originally..pls help me to know what that lump could be?