Thanks for the query,
you might be suffering from furuncle
It is a deep bacterial infection.
Bikni line is prone to develop this type of infection due to moisture and impaction
Take a course of antibiotics.
Apply an antibacterial cream like mupirocine.
Hot fomentation is also good,
It helps in accumulation of pus, which can be drained later.
Let me know if you have any other doubt.
you can ask a direct question to me on this forum, following the below link.
Wishing you a good health.