Talk to Gynecologist on Smal Hemorrhoid)near Anus

I had little intetcourse first time from anus. Next day I felt a little swelling and kind of small pimple near the opening of anus. It's been 3 weeks, but it has not disappeared. It moves little like a pearl if I touch the pimple. I don't feel any pain or itching there. Please suggest me some treatment.