Welcom to HCM.
Most likely it is due to infective inflammation.It usually starts with hair route infection and gradually spread to other follicle. Lymph
nodes are enlarged due to infective drainage
Keep proper local hygiene.Use antiseptic liquid or soap to clean this area.
Apply antibiotic skin cream like fusidic acid
Start proper antibiotic like amoxy/clave to subside infection and nsaid
to subside pain and inflammation.
It will recover within 7 to 10 days.If not subside with oral and local treatment than consult surgeon for further surgical management.