Perianal Abscess. A head at some point?

Hi, I'm forty years old, female. I have had a mild swelling at 10o click region near my anal opening. Between the vagina and the anal opening. I have a bit of discomfort but no pain. There's no pus or discharge. I have external hemorrhoids and an taking fibogel everyday. I do not have any bleeding. I don't see a head on the Abscess either. It just feels like a soft swelling. I met with a gastro who has advised cifran 500 for 7 days. I have a bit of a pain in my back and slight irritation when I urinate. My urine culture and routine is normal. My blood reports also normal. What I'd like to know is will the swelling reduce and go away with antibiotics? Are there chances I'll need a surgery? Will the Abscess develop a head at some point? What can I expect in a week. I have a baby at home and I want to be sure I don't have to get a surgery. This is the first time I'm facing something like this. Please advise and do give me clarity. My period is due in ten days as well. thank you