I was taking a bath a week ago, and while bathing, I developed a few bumps that hurt and a rash that would be about the size of a dessert plate. It was very sore and itchy (I didn t itch it), and if I got water on it, it would sting. After a week, the bumps disappeared, as well as the rash, but now it feels like a scab. This has happened a few times always in the same spot ... just above my tailbone. Should I be alarmed?