Yes, Hi. My Wife Is 56-years Old. I Am 53.

Yes, Hi. My wife is 56-years old. I am 53. We have a 33-year old, Special Needs daughter. About one month ago my wife developed pink, itchy spots on her back side. She itched horribly from her waist to We thought it may be an allergy to detergent but were curious as to why it was only irritating the mid section and groin. About two weeks ago, I developed a rash around my waistband. It doesn't look exactly the same but it's a red rash around my waist and groin area, lower stomach and back and upper legs. My wife went to a local dermatologist who prescribed steroidal crème and Hydroxyzine. However, he didn't really give a diagnosis. Can anyone help me?