Hello my friend Thanks for your question on HCM I was reading very carefully your problem .And i think what your problem is related to eating gluten.Allergies caused by eating gluten appear in different ways on people, some can have rash like you,some diarrhea or some pain throughout the body. The main treatment for your problem is not to eat any food that contains gluten for the rest of your life. The symptoms then usually go within a few weeks. The main foods to stop are any that contain wheat, barley, or rye. Many common foods contain these ingredients, such as breads, pasta, cakes, pastries and some cereals. Foods made from oats are usually safe to eat. However, some people have symptoms if they eat oats. Potatoes, rice, maize, corn, fruit, dairy products and soya-based foods are fine. Avoiding gluten is for life. If you eat gluten again, symptoms will return. Even small amounts of gluten can cause the symptoms. To avoid symptoms and complications, you must be strict about avoiding all foods that contain gluten. Be careful even medication can give rash.Talk to your doctor about medications and try to stop them if you think you are having rash from them. Hope this information is helpful to you Best regards