I have had this 3 years. 2nd year it started moving down below my knees. It is still on my torso but it has faded a lot. The back of my knees and down the sides of my legs is very dark red in big circles. Im 73 with autoimmune issues. To your question. No cure. I am learning more and more. If it goes away, it can return and may be worse. Many have it 2 years and some have it forever. I use steroid cream to help itching and if it goes into a full attack my doctor gave me Atarax. The itch usually starts in the evening and I get big whelts like ant bites. Just maddening. I hope my bit of info helped. A note: contacted center for disease and they gave me a bunch of sites to read. I am looking for some volunteer research sites. I have hopes that if I can help research, help others and learn more, I'm in.