I have had a dry rash on my inner thighs for about 2 yrs now. At one point I do remember it going away but it came back. The rash isn't raised it is slightly grayish/white and sometimes but not often itchy. I have never had sex
This may b a rash caused by an irritation brought about by friction of the skin between both thighs. Another differential may be a dermatitis or a fungal infection. This does not sound like an STD. A psoriatic