Thanks for the query.
According to your description the lesion you mentioned could be a bartholin abscess
lies at the level of upper two third and lower one third of labia minora
When the duct of the gland gets blocked cyst
will form and when the cyst gets infected abscess will form.
So you consult gynecologist get examined and take medicines to decrease infection and pain.
Sitz bath can help to some extent in decreasing the symptoms.
For more details you can ask me through: http://www.healthcaremagic.com/doctors/dr-sree-gouri-sr/63429