Am a 20 years old female. I have noticed(it happend twice of what i remember or strongly noticed,mostly) blood stains in my stool lately and its happening only after my periods.It 's continuing for two to three days maximum but i have no pain or any discomfort at all. And i also noticed a small(tiny) bulb like structure near the opening of my anus. it has been there like that from almost one and a half year but no discomfort,pain,swelling,any discharges or anything abnormal,its like just existing there.So what should i do . . . ? any possible diagnosis for the symptoms would help me alooot