Why do I have vaginal rash before and after my period?

 It's likely a fungal infection.

Many women experience a vaginal rash before and after their periods. This is often caused by a fungal infection, which is more common during times of hormonal changes (such as before and after your period).

There are many over-the-counter treatments for vaginal fungal infections, such as Monistat. If the rash persists or worsens, you should visit your doctor for diagnosis and treatment.