Thanks for the query.
That could be some localized infection.
If the pus is still collecting, better to consult gynecologist or general surgeon
once and get examined to find out the actual nature of the lesion.
Pus should be drained out where ever it collects, so complete drainage
of the lesion is needed.
And you may need local antibiotic
For more details you can ask me through: http://www.healthcaremagic.com/doctors/dr-sree-gouri-sr/63429