Wondering what causes a reddish area that is painful, but not itchy on both buttocks near tailbone. I am 71 female. Have had it 2 years since i fell, landing my tailbone on a case of 16 oz water bottles. Tailbone was swollen for seveal months. Not now, but the soreness has not gone away. Dr tested skin twice, normal, nothing. Dry skin. It is very painful. All blood work normal.