Thanks for your query.
As you describe ,lump in your vagina may be Bartholinitis .
To be determined you should go to examine by your doctor,only with inspection of your vagina.
To relief your pains you can use:
SITZ baths three times daily ,soaking the cyst
for 10 to 15 minutes
holding a warm compress
using painkillers such as paracetamol
If the cyst becomes infected and an abscess
(a painful collection of pus) develops, you may be prescribed antibiotics to clear the infection.
Take care of your self