Hello
Thanks for posting your query at DoctorSpring.com
I can understand your concern.
This seems to be a furuncle which is a bacterial infection of the skin. You need to apply mupirocin cream twice a day on it.
In case it doesn't subside within three to four days, you will need a course of an oral antibiotic like azithromycin.
You will need a prescription from your doctor.
Please let me know if you have any queries.
Regards.