Hi,
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If you have had vaginal manipulation, introduction of any object or finger, chances are that you would have ruptured your hymen. The lump that you felt inside vagina could have been the cervix. However, it is difficult to comment on the vaginal lump that you describe without examining you. Visit your doctor/gynecologist for further examination to look for the lump and determine its probable origin (as well as confirm if the hymen is intact). Avoid self manipulation.
Take care.