She needs to see a vet. If she is peeing outside her box that definitely means she is experiencing pain when using the box. In a cat's brain they think if they pee someplace else the pain will go away. No clue what is above her tail, but you need to act since she will pee everywhere.It's right above her tail between her back and her thigh. I just noticed it. She was acting weird yesterday and seemed to be in pain while urinating and peeing in strange spots (laundry baskets). I assumed she had a uti but now I see this spot.