Thank you for sharing your question with the EmpowHER community.
How would you describe the pain? Is it like a burning, aching or soreness?
Do you have any pain in your thigh area at all?
There is a condition called Vulvodynia which is chronic pain or discomfort in the vulva.
Here are 3 resources to help you further investigate:
What is Vulvodynia?
Finding Relief from Vulva Pain
Then there is this one. Be sure to pay close attention to the What It Is Not section:
Vulvodynia Pain Society
You absolutely should get it checked, especially since you have a white patch area. Make an appointment to see your doctor soon. You need to know what it is and how to proceed in taking the very best care of yourself.
I hope this helps.