I dont know why. I also have a very dark neck on the back? And I have black itchy scaly patches between my breasts and I use lotriderm I used it for a week and it didnt work. Should I carry on using it? I thought it made it worse but maybe I m just stupid. Also I was given another medicene ontop of that called doublebase gel, I started wearing this today. What should I do? Thank you doctor.