How do i know if it is an ingrown hair on my vagina?

Inspection, or see d: An ingrown hair will typically look like a small red pimple and you can usually see the hair follicle centrally located within the pimple. If you are very careful and use peroxide - you can try to extract the ingrown hair, but 'squeezing' lesions in this area is fraught with risks for making the infections worse. A doctor visit could give you a definitive answer if you needed confirmation.