This is the cervix of a 28 year old woman who gave birth vaginally 4 years ago. Her cycle normally lasts about 30 day and she has no history of STDs.
She noticed she was having irregular periods for a few months and consulted her doctor. She was diagnosed as having a cervical polyp, a (usually benign) growth on the cervix which can cause irregular bleeding, bleeding after intercourse, or heavy periods. About 7 months ago, she had it removed in a simple surgery called a polypectomy. Click here for a very graphic video of a poylpectomy. Her cycle returned to normal within 3 months after surgery.
You can how the cervix is open and red at the os, the site of where the polyp was growing. It was successfully removed 7 months ago.