Hi welcome to Health care magic forum.
Thanks for calling H.C.M.
It appears to be a boil, full of pus ready to be burst. I advise you to consult a surgeon for diagnosis and treatment. You may need to have an incissoin, and drainage
of the swellig.
You can also consult your gynacologist if you feel it comfertable.
Other possibility of swelling is herniation into the pubic region.
Wishing for a quick recovery.