Hello and welcome to healthcaremagic
I would keep a possibility of recurrent furuncle/Boil OR
Hidradenitis suppurativa
Furuncle/Boil is bacterial infection of the skin and
soft tissue whereas Hidradenitis Suppurative is a disease of the apocrine sweat glands bearing sites like perineaum, axilla, areola etc where the inciting factor is follicular occlusion with secondary bacterial colonization.
The best way to approach is to start on an empirical oral antibiotic for a week OR 10 days (My choice of oral antibiotic would have been
Amoxycillin 500mg in combination with
clavulanic acid 125 mg, thrice daily, for a week OR
Cephalexin 500ng thrice daily OR Cefadroxil 500mg twice daily, for a week). This would take care of the infection.
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.
I would also suggest a blood sugar test to rule out diabetes.
Avoid shaving in that area.
regards