Pain on my inner thigh. It feels like there is a bruise, but there isn't. It's very sensitive to the…

Pain on my inner thigh. It feels like there is a bruise, but there isn't. It's very sensitive to the touch. Even if I don't touch it, it hurts. What could it be because it's getting very uncomfortable not being able to walk without cringing. Size wise, it's about the size of an orange.