I have this skin condition from many years but recently it is increased. If I scratch my skin then the skin reddens and raises a weal. This happens even with clothes and bedsheets. Becomes very itching. Even when I bath , I get this scratches all over body. Please suggest if this is curable completely and how long does it take. I searched in net and found my condition is called "Dermatographia"( the symptoms are 100% matching).