Hello,
Thanks for posting your query at DoctorSpring.com
. I can understand your concern.
I reviewed the picture. You seem to be having a furuncle which is a bacterial infection. I would recommend application of mupirocin cream twice daily for a week. In case it doesn't start improving in 2 days, you might need a prescription for an oral antibiotic like azithromycin.
Please let me know if you have any queries.
Take care