Maddie developed a bump on her tush a week ago ... and I cannot figure out what it is. It is slightly red, not hot or any heat, and does not hurt at all. It feels like a lump under the skin. I don't think it is an infection as I don't see any signs of pus or heat radiating from it. I use her tush for sensors only but did not shoot a sensor in this area. In fact, this area is lower than where I do shoot in the sensors. When I first noticed the bump I thought maybe it was a bug bite, but it has not gone away. I am going to call doctor on Monday for appointment but I thought someone here might have an idea of what it is. Any help is appreciated. Thanks!