Hello and welocme to HCM
based on the location of the lump it seems that you have a Bartholin's cyst
is present in the area between labia majora
Its function is to secrete mucus ahich lubricates the vagina.
Bartholin's gland can become irritated or infected resulting in pain.
If the duct becomes obstructed a Bartholin's cyst can form.
If the Bartholin's cyst becomes infected, abscess
Treatment consists of marsupilization/ deroofing of the cyst and antibiotics.
node is unlikely at this region as this is not the location of lympn nodes.
Besides Bartholin's cyst this swelling could be some skin nodule.
Consult your gynaecologists for clinical examination, investigations and management.
Dr Shailja P Wahal