How is your daughter? How old is she and what are other symptoms present? Lump in the vagina may be caused by infection, inflammation, folliculitis as well as skin and gynecological issues like bartholin's cyst. While unusual bleeding, discharge or spotting may be a symptom of uterine cancer, diagnosis still depends on a variety of factors. If it persists, it is best that you have this checked by a gynecologist for proper evaluation. Direct clinical examination and additional diagnostic tests may need to be done. Take care and do keep us posted.