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Is it painful?
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Ok thanks for the pictures.
The lump is right at the opening of the vagina.
This is a benign cyst arising from the lining of the vagina ( labia majora).
This does not cause any problem usually.
However, this can be removed by a gynecologist if needed.
This is likely a bartholin cyst --a common occurrence --may get hard from scar tissue formation.
No very unlikely.
Although not urgent, you can get it checked by your doctor also.
Usually nothing --just observation.
if it is getting bigger then it will be removed surgically --minor procedure.
The size can fluctuate mildly.
But keep an eye on it.
if it becomes painful or even bigger then you should see your doctor to remove it.
this is still considered a benign growth.
the size may change due to the influence of estrogen.