Do you walk alot, if so, this could be an in
grown hair more than likely, especially due to friction form sweatin
g and walkin
g a lot.
It will probably go away on its own but it will take time. Put warm compresses on the area, it should brin
g the puss to the surface and you may be able to squeeze it then and fin
d a hair.
You may get an antibiotic oin
tment and apply it for a few days or a week. If it’s not ana in
grown hair, it may just go down afte
r antibiotic oin
Try different stuff.