Usually pink discharge is just vaginal discharge that is mixed with a little bit of blood. Any change in your vaginal discharge, especially if it is accompanied by uncomfortable itching or burning, should be evaluated by a physician. In your case, I think there are several possibilities. The most likely possibility is that you have a vaginal infection
. Infections with yeast, bacteria, or parasites could be responsible. A standard yeast infection usually causes a whitish discharge with some itching in the area. Bacterial vaginosis (or BV for short) is an infection with a bacteria that can cause a smelly discharge with some irritation in the vulvar area. I think this is the most likely possibility in you. An infection with trichomonas can also cause these symptoms. This is a parasite that is transmitted sexually. Other sexually transmitted infections are also possible.
I suggest that you schedule an appointment with your OBGYN. He or she can take a more detailed history of your symptoms and perform a thorough pelvic exam. A sample of your discharge should be analyzed under a microscope to look for evidence of any of these infections. Hopefully, this will give you the answers you need and treatment if necessary. Good luck.