My labia burns when sitting at work or long periods of time. what would cause this?

Labial burning: There are multiple possible causes and an Obgyn can help evaluate you. Yeast, herpes and shingles are infectious causes. Vulvar vestibultitis is a over active nerve disorder. Inguinal hernias can cause radiating pain down the labia. Pudendal neuralgia is a server entrapment disorder associated with trauma from vaginal delivery. See an Obgyn for evaluation