I have a cut

A cut inside your vagina isn't what I would call normal, but it definitely does happen. If it is in your vagina it would be more like a tear, This can happen for a variety of reasons. Not enough lubrication, rough sex without lubrication, even a vibrator having a little rough part on it. And depending on the time of the month, a tampon being inserted incorrectly, a scratch from your fingernail while insterting the tampon etc. The only thing I AM worried about is if there is anything else going on, such as spots, bumps, discharge etc. If there are none of these then you have probably nicked yourself. IF there are other symptoms with this cut, you need to go get an internal investigation done. Something else just came to my mind, have you had an internal exam recently with a spectrum(?) that might have something to do with it too. Keep the area clean and dry until the cut is healed you don't want there to be an infection. And if you DO get one, get immediate medical help, as you will need some anitbiotics. Good luck and health