I AM AN 83 YEAR WOMAN. I HAVE RECENTLY SEEN/FELT

I AM AN 83 YEAR WOMAN. I HAVE RECENTLY SEEN/FELT A LUMP AT THE ENTRANCE OF MY VAGINA. I HAVE HAD, WHEN I WAS MUCH YOUNGER, MY UTERUS REMOVED AS WELL AS TUBES. I HAVE NOT BEEN SEXUALY ACTIVE FOR SEVERAL YEARS. WHAT CAN BE THE CAUSE OF THIS? THANK YOU FOR YOUR REPLY.