Hello,
Welcome to healthcaremagic
I would keep a possibility of Furuncle/boil, which is bacterial infection of the hair follicle with surrounding
cellulitis.
The infection usually gaining entry through the hair follicle.
The best way to approach is to start on an empirical oral antibiotic for minimum 5 to 7 days (
Amoxycillin 500mg in combination with
clavulanic acid 125 mg daily three times or
cephalexin 500mg twice daily or cefadroxil 500mg twice daily).
This would take care of the infection.
You are on the right antibiotic which you are taking tab.forcid and I would suggest that you continue with it for a another 5 to 7 days.
Antibiotics should be taken up to 7 days to produce a noticeable improvement.
An OTC antibacterial cream/ointment e.g 2% mupirocin can be applied twice daily.
An OTC pain killer e.g ibuprofen once or twice daily would help you deal with the pain and reduce swelling and discomfort
If the lesion doesn't respond or continue to enlarge, it may have to be incised to drain the pus.For which you may need to see
dermatologist for once.
Regards