If there is such a thing as a higher crown chakra (I did not investigate this yet), then it is not "between the crown and the brow" as you state, since your picture clearly shows it is hovering above the head. So what can it be then? Im honestly not sure about that, but energy (chi) flows in the human body can do/cause weird things sometimes. It might have something to do with energy stuck at that point. I would advise to meditate on it and get your answers thus .