Thanks for the query.
It is difficult to tell the nature of the lump with out examining.
That could be due to folliculitis
or that can be some benign lesion like lipoma
So you better consult gynecologist once and get examined to find out the actual nature of the lesion.
After examining she can made out the actual nature of the lesion and treatment can be given accordingly.
For more details you can ask me through: http://www.healthcaremagic.com/doctors/dr-sree-gouri-sr/63429