Hello and welcome to healthcaremagic
I have gone through your query and I have understood it.
This is a boil/Furuncle.
A Boil or a Furuncle is actually bacterial infection of/ about the hair follicles often associated with surrounding
cellulitis. The infection gaining entry through the hair follicle.
If I was the treating doctor I would have suggested an oral antibiotic for a week.
My choice of oral antibiotic would have been either:
Amoxycillin 500mg in combination with
clavulanic acid 125 mg, thrice daily for a week
OR
Cephalexin 500 mg thrice daily for a week
OR
Cefadroxil 500 mg twice daily for a week.
An OTC topical antibacterial e.g 2% Mupirocin twice daily can be applied over the boil.
An OTC pain killer e.g Ibuprofen 400mg (bruffen tablets) twice or thrice daily, would provide symptomatic relief from pain and swelling.
If the boil continues to enlarge and becomes fluctuant and soft, it may need to be incised to drain away the pus.
Hope this helps
Regards