My mother's age is 55.Her period was completely stopped before 5 years......Before 6 months my mother operated cervical polyp. After  the 1 month of the operation, she felt itching in her vagina and then burning in her vagina then she met with a doctor ,the doctor gave her medicines then the burning was stopped... but before 7 days , she is spotting with brown colour. The next next spotting was occurred after the 3 days of the first spotting. But today my mother tells that her vagina is burning. So doctor tell me what is the cause please.