Help please

Please help I don't know what's going on but I stay real constipated. And it's been a little uncomfortable my booty area. I thought it could of been the soap cus I'm very sensitive. And so today I decide to check it out because it's been killing me. And it's a small bump on my butt hole I read it could be cus I stay so constipated. And I do not have any STD I get tested ever year and so does my husband so I'm not worried there!!!!! So does anybody know what it could be????